Calculation of the ovulatory period for irregular periods. Calculation of a personal ovulation calendar

This article is for informational purposes only. If you discover symptoms of any disease or feel unwell, consult a doctor first! The tips in this material can help you in emergency situations when it is not possible to contact qualified medical personnel.

Ovulation is a process that occurs once during the female menstrual cycle. A mature egg is released from the ovaries and awaits fertilization by a sperm. The most favorable time for conception is the day after ovulation.

The process of ovulation itself;
How to calculate ovulation yourself;
About what affects ovulation.

Thanks to the knowledge gained, you will be able to control the menstrual cycle, determine the days of ovulation after menstruation and plan a pregnancy.

What happens during ovulation

The female body has many unique features, including the functioning of the reproductive system. Female reproductive cells, which are called eggs, are formed in girls during intrauterine development. The ovaries serve as a “storage chamber” for eggs.

After puberty, girls undergo a menstrual cycle, during which the egg regularly matures; when it has not been fertilized, at the end of the cycle it is released with menstrual blood.

The menstrual cycle is a biological process that repeats with a certain rhythm and prepares a woman’s body for pregnancy. For the average woman, from the 1st day of her period to the 1st day of her next menstruation, it takes not exactly a month, but 28 days. Cycles that last 21 to 36 days are considered normal.

Hormones and the three phases of the female cycle

Hormones are responsible for all processes that occur in the reproductive system, the main ones being:

FSH - follitropin or follicle-stimulating hormone;
Prolactin;
Estrogen or estradiol;
LH - lutropin or luteinizing hormone;
Progesterone;
Androgens.

If all a woman’s hormones are normal, then ovulation occurs in the middle of the menstrual cycle.

First phase

The first day of the menstrual cycle is considered the day the period begins, and the entire period of the cycle is usually divided into three phases:

Follicular;
Ovulatory;
Luteal.

The follicular phase is the time leading up to ovulation. On the very first day of vaginal discharge, a follicle begins to mature in the ovaries. A follicle is a fluid-filled sac in the ovaries that contains an egg. Under the influence of the hormones FSH and LH, which are produced by the pituitary gland, from the first to 7-8 days, several follicles mature in the right and left ovaries. After 7-8 days, and in a long cycle (menstrual cycle, which lasts over 30 days) after 11-12 days, one main one is determined - the dominant follicle, which continues to grow, and the rest regress.

During the period of growth of the dominant follicle, under the influence of the hormone estrogen, the mucous membrane of the uterus thickens, which prepares to receive an egg fertilized by sperm. A follicle that has reached a diameter of 7-10 mm is considered dominant; every day it increases by an average of 2 mm; by the middle of the menstrual cycle it should grow to 22-24 mm and burst, releasing the egg.

The second phase of the cycle is ovulation

Around the middle of the cycle, the mature female reproductive cell is ready for fertilization. The lifespan of the egg, i.e. The time at which fertilization can occur is considered to be 24 hours after the follicle bursts and ovulation occurs.

Spermatozoa that have reached the uterus will be viable for up to 5-7 days. If sexual intercourse does not occur on the day of ovulation, but even 3-5 days before the release of a mature egg, the probability of conception is very high.

If fertilization does not occur, the female reproductive cell does not meet the male reproductive cell - the sperm, then the egg along with the epithelium is released from the walls of the uterus in the form of menstrual discharge.

Third phase of the menstrual cycle

The luteal phase or corpus luteum phase occurs after ovulation. The luteal phase lasts 12-14 days before the start of your next period. If fertilization has occurred, the luteal phase supports the production of progesterone, which ensures the fixation of the fertilized egg in the walls of the uterus. In case of failure and an unfertilized egg, the endometrium - the inner mucous membrane of the uterus - dies, progesterone and estrogen decrease and bleeding begins. With the onset of menstrual bleeding, a new follicle begins to mature again, which will lead to new ovulation.

Ovulation period and its calculations

If a woman controls her menstrual cycle, she can easily calculate the days of ovulation and plan pregnancy. There are several ways to calculate and determine ovulation:

Maintaining a calendar;
Basal temperature measurement;
Ovulation test;
Monitoring folliculogenesis.

Each woman can choose the method of determining favorable days for conception that will be convenient for her, ranging from the simplest, but less accurate, to the method of ultrasound examination with 100% accuracy.

Women's calendar

The simplest, but not the most accurate method of calculating ovulation is considered to be keeping a calendar of critical days. Gynecologists recommend that everyone keep a calendar in which the first day of menstruation must be marked every month. When 3-4 dates for the start of menstruation are marked on the calendar, you can calculate the average duration of the cycle.

The figure shows the calendar of a woman whose cycle is stable and lasts 28 days. In order to calculate the day of ovulation, you need to calculate the middle of the cycle:

The 14th day after the start of menstruation is expected to be the day of ovulation.

Fertile days - days favorable for conception as a result of unprotected sexual intercourse are considered 3 days before ovulation and 2 days after.

Women's smartphone apps

Our mothers and grandmothers kept pocket calendars, today it has become much easier to control the menstrual cycle with the help of applications for your smartphone. You can choose any convenient program and download it in a couple of minutes and completely free. There are a lot of functions in such modern applications; they will not only tell you the period of ovulation and safe sex, but will also help you monitor your mood, the amount of discharge, mark sexual intercourse, and more. Various options will help you customize the application so that it is as useful as possible for you, and even notifies you of upcoming ovulation.

Interface of the smartphone application “Women’s calendar”

Basal temperature and its measurement

Basal temperature is the lowest temperature measured after continuous sleep for more than 6 hours, at rest. This method of determining the day of ovulation after menstruation is more accurate than keeping a female calendar. Regular measurement of basal temperature allows you to recognize:

The phase of the menstrual cycle and the onset of ovulation;
Fertilization, attachment of the egg;
Hormonal disorders;
Inflammation in the reproductive system.

To analyze basal temperature, all measurements are entered into a graph, where the vertical axis is degrees, and the horizontal axis is the day of the menstrual cycle in order.

During menstruation - 37°C;
After the end of bleeding, it decreases to 36.3°C;
Until the middle of the cycle, 36-36.6°C is considered normal;
During the ovulatory period, the temperature should be within 37.1-37.3°C for three days;
It stays at 37.1-37.5°C and begins to decrease 3 days before the new period;
If fertilization fails, then before menstruation it drops to 36.9-37°C;
With successful fertilization, the temperature level does not fall below 37°C.

Your temperature may differ by several points, but a difference of at least 0.4°C in different phases of the cycle is considered normal.

Rules for measuring basal temperature

In order for your basal temperature chart to be as informative and reliable as possible, you should follow these rules:

Measure your temperature regularly, without skipping days, for several months in a row. Data from one month of measurements will not provide objective information; only by analyzing three or more basal temperature graphs can accurate predictions about your cycle be made.
Measurements are taken daily at the same time in the morning. If the time differs by more than half an hour from previous measurements, the data obtained is considered unreliable.
The temperature is measured immediately after waking up. A woman should not get out of bed or make sudden movements. This temperature should be measured in the most restful state after continuous sleep for at least 6 hours.
Measurements are taken rectally. The thermometer is left in the anus for 5 minutes. There are options for measuring in the mouth or in the vagina, but the classic and recommended method is rectally. With other measurement methods, the degrees differ from those that we showed in the measurement chart.
Use the same thermometer for each measurement, because an error of one tenth of a degree will affect the overall assessment of the information.

Thus, an increase in basal temperature in the middle of the menstrual cycle is a signal that the egg has matured and begins its movement from the ovary to the uterus. The median temperature is 37°C, a temperature spike of 0.4°C and the fact that it rose above 37°C is a clear sign of ovulation.

Ovulation test

Pharmacology has developed convenient home tests so that women can determine the onset of ovulation with great accuracy. Such tests are recommended for women who have not been able to get pregnant for more than six months in order to predict the day of ovulation and increase the chances of conception.

Tests to determine ovulation determine the concentration of luteinizing hormone (LH) in the urine. LH peaks when the egg leaves the follicle.

Types of tests

There are several types of ovulation tests:

The test strip is a regular paper strip that must be immersed in urine for a few seconds. On such a test there is a pink control mark; depending on the concentration of LH in the urine, a second colored line will appear; the closer its shade matches the control, the greater the concentration of the hormone. These tests usually involve 5 paper strips. They are recommended to start every other day from the 11th day of the cycle. One colored stripe or a very pale stripe means that the test is negative and ovulation has not occurred. As ovulation approaches, the second stripe should become brighter, and at the moment of ovulation the color intensity should match the control stripe.
Jet test. A more optimized version of the ovulation test, but the principle of operation is similar to the strip test. This test must be placed under a stream of urine; there is no need to immerse it in urine.
Digital test. Such tests determine the day of ovulation with 99% accuracy. Unlike the previous two options, this test determines the presence of the LH hormone in saliva. This test is shaped like lipstick and is reusable. The principle of operation is the same as in a microscope; the test shows the concentration of LH in dried saliva. Before performing the test, please read the instructions carefully because in this test it is important not to drink or urinate 2 hours before the test.

Important! Pharmacy tests for ovulation are considered twice as reliable as determining this important day using a woman’s calendar.

Symptoms and sensations

Some women claim that they feel the moment of ovulation. This is quite possible, because the follicle bursts when the egg is released and this may be accompanied by a slightly painful sensation. By observing yourself, you can identify several more symptoms of ovulation:

Bloating and pain in the lower abdomen;
A drop of blood on underwear as a result of a ruptured follicle;
Vaginal discharge has become more abundant and resembles egg white in consistency;
A surge of hormones. You may feel increased libido, a change in mood, and how your breasts become fuller.

Some women calculate the day of ovulation in order to get pregnant safely, while others, on the contrary, want to avoid conception. Since ovulation is the process of the release of a developed egg from the ovary, which is fully prepared for fertilization, this period is the only favorable one for pregnancy.

This means that a woman who wants to become a mother needs to have an active sex life at this time. And that girl who does not yet want to have a child should abstain from sexual intercourse during these dangerous days or use reliable protection. How to calculate ovulation so as not to make a mistake? Ovulation can be calculated in many ways. Let's consider each method in detail.

Feelings during ovulation

Sometimes women feel the days of ovulation, since at this time some changes occur in the body:

A woman may feel slight pain in the lower abdomen.
Vaginal discharge increases.
Ovulation also affects sexual desire, which becomes much stronger than on ordinary days.

Calendar method

In order to use this method, you need to study your body well and know everything about your own menstrual cycle. At the same time, it is important to keep a calendar and mark the days of your menstruation there. Data for the past six months will be useful for the calculation. As a rule, the menstrual cycle lasts 27-32 days. You should count on the calendar how many days have passed from the first day of the past women's days to the onset of the current ones. This number will tell you how long your cycle lasts.

If during the calculation it became clear that the interval between menstruation is the same all the time, this means that the cycle is regular and this method is suitable for calculating the day of ovulation.

Now you need to look at your calendar entries and determine the shortest cycle that occurred within the last six months. From this number you need to subtract 18. The resulting number is the day from which the suitable period for conception begins. Next, you can find out which day of the cycle is the last favorable day. From the longest cycle you need to subtract the number 11. Now you know how to calculate the day of ovulation using the calendar method.

But it is worth remembering that the shift in ovulation days can be affected by anything: health, stress, taking certain medications, lifestyle changes, etc.

Basal temperature

How to calculate the ovulation period based on basal temperature? Ovulation has little effect on a woman's body temperature. Therefore, in this way it is possible. This is a reliable method, unlike the calendar method, the data will be more accurate. On the day of ovulation, when the egg is released from the ovary, the body temperature is slightly reduced. And after this day, the temperature, on the contrary, rises and remains at the same level until the first day of the next women's days.

You need to measure your temperature from the first day of your next period. So, immediately after you open your eyes in the morning, without getting out of bed, place the thermometer in the anus, about four centimeters. Thus, the temperature should be measured strictly at the same time every day. All data must be recorded. Before ovulation, the temperature, if the woman is healthy, remains at the same level - 36.6.

As soon as there is a decline, even a small one (36.3), this means that it was on that day that the ovary released a mature egg. And the next day there will be a sharp increase in temperature to 37 degrees - this is the best time for fertilization. However, we should not forget that an increase in temperature can occur as a result of any disease, or due to lack of sleep or alcohol consumption.

Such observation must be carried out three to four cycles in a row. If, after a long check, a woman sees on the schedule that ovulation always occurs clearly on the same day of the period (for example, on the fourteenth or fifteenth day of the cycle), then she can be sure that this method is suitable for her. The best time for pregnancy is usually considered to be from the tenth to the nineteenth day from the beginning of the menstrual cycle, that is, the day of ovulation itself, 5 days before its onset and 3 days after it are taken into account. Accordingly, the safe periods are up to the tenth day of the cycle and from 10 to 28 days.

Test strips

Today there are modern methods for calculating ovulation. Such strips are sold at any pharmacy; they are very similar to pregnancy tests.

Test strips determine the most suitable days for conception. They respond to the content of gteinizing hormone in the urine. A large amount of this hormone appears in the urine 24-36 hours before ovulation. That is, when the test becomes positive, this indicates that the favorable moment has come for pregnancy.

However, it is important to know that if ovulation occurs in the morning and the test is done in the evening, then it is likely that by that time the level of the hormone will have already decreased and the strip will show a negative result. The level of the hormone LH, which is necessary to determine ovulation, remains in the urine for only 24 hours. As a result, the conclusion suggests itself - it is better to do the test twice a day so as not to miss this moment.

When using the test, it is important to follow some recommendations and rules:

The test must be performed at the same time every day.
You can choose any time between ten in the morning and eight o'clock in the evening.
The first morning urine is not suitable for testing.
Reduce fluid intake 1-3 hours before the test.
Testing will not be useful if the woman is taking medications that contain LH.

Be sure to follow all manufacturer's recommendations contained in the instructions. Results can be assessed 1-30 minutes after testing. After this period, it is not recommended to take the results into account.

The result could be:

Positive - the test line is very bright, the color is similar to or darker than the control line.
Negative result - one test line is much lighter than the control line.
Error in execution - there is no control line on the test.

An ovulation test can sometimes be a false negative. Why could this be? There are, as always, several reasons: in the body of each woman during ovulation, an unequal amount of the LH hormone is produced, testing times are different, ovulation tests are different, which means they may have different sensitivity, different concentrations of urine (affected by the amount of fluid drunk).

All this makes it difficult to determine favorable days, which is why you will have to adapt to ovulation tests for some time. At first, it is better to combine them with measuring rectal temperature, the calendar method, and monitoring the nature of cervical discharge.

Disadvantages of tests

Carrying out such tests requires the expenditure of significant material resources, since they need to be carried out over a week or even more. If testing is carried out once a day, then there is a risk of missing the moment of ovulation. In addition, with an irregular cycle, you cannot completely rely on test results.

We calculate by allocations

How to calculate the time of ovulation by discharge? Discharge is cervical mucus that changes during the menstrual cycle. Therefore, every day you should keep notes about the nature of such discharge. Run your finger from the front wall of the vagina to the back. The mucus will vary in consistency (elastic, thick, sticky), color (white, yellow, transparent) and texture (dry or wet). On the day when ovulation occurs, the discharge is the most transparent and has an elastic and slippery structure.

How to calculate ovulation if your cycle is irregular?

If the cycle is irregular, then only ultrasound monitoring of follicle growth can help. Of course, if you only need accurate results. You can rely on the method of measuring basal temperature, but still, due to the shift in the cycle, it will be more difficult to do this, and the result will be unreliable.

The first examination must be done on the seventh day of the cycle, the second on the eleventh. When an ultrasound shows that the follicle has reached a size of 20 mm, this means that ovulation will soon occur. This method will also help to find out whether the follicle has ruptured or whether the egg has been released. If a gap occurs, a corpus luteum will form in its place.

If suddenly there is no rupture, then this is unovulated follicle syndrome; such a deviation must be treated. Now you know how to calculate ovulation if your cycle is not regular. Any other methods in this case may give a false result.

How to calculate ovulation online

Replies

A regular menstrual cycle is proof of women's health. Any woman knows that she can get pregnant every month. After all, only with a healthy menstrual cycle and systematic sexual life will the egg be released. Ovulation is the process of the release of an egg from the ovary into the fallopian tube, which is ripe for fertilization. In other words, these are the days in the middle of the cycle that are favorable for conception. Sexual intercourse can be performed not only on the day of ovulation, but also several days before its onset.

Fertile days may depend on the following circumstances:

Well-being and hormonal background of a woman
The viability of sperm in the genital tract may vary. You can predict their life expectancy by taking a spermogram. Pregnancy can occur after sexual intercourse that occurs 4 days before ovulation. And it happens that even the day before ovulation, fertilization does not occur, since there are few sperm and they are inactive.

If a woman has regular periods, then calculating ovulation is not at all difficult.

Typically, women determine the day of ovulation in order to avoid unwanted pregnancy, or, conversely, for the long-awaited fertilization. There are the following main ways to determine your lucky days for conception:

Special test
Symptoms and discharge
Basal temperature measurement schedule

Irregular cycle

Irregular periods can be due to various reasons. And the biggest problem with this is calculating the ovulation period. This is important for those who want to have a child. Ovulation is the best period when the egg is ready to meet the sperm. Therefore, it is very important to know its exact occurrence. After all, ovulation lasts only about 14 hours. Keep in mind that an irregular menstrual cycle may indicate the presence of serious illnesses that need to be treated before pregnancy. Be sure to get a full body test before you get pregnant.

CALCULATION OF OVULATION

Ovulation tests

Tests measuring hormone levels can help determine the best time to conceive, but are problematic. After all, it is almost impossible to calculate the moment to conduct the test. Even if you do a test taking into account the counting of several days from the first day of menstruation, there is a possibility that the test result will be false. The result may be affected by the existing disease, which provoked the cycle failure. Therefore, to avoid false results, resort to tests after several months of regular menstruation.

Before ovulation the test will be positive. Tests may need to be done daily to accurately determine when to take action.
The position of the cervix and observing the consistency of the discharge can help guide testing. In addition, the test package contains instructions on what actions to take if your cycle is irregular.

Determination of basal temperature

This method, which is effective for calculating ovulation, even with irregular periods, will help you calculate ovulation during an irregular cycle. The most important thing is to measure body temperature daily for several months in a row in the rectum with a regular mercury thermometer. It is necessary to prepare an alarm clock and a mercury thermometer in the evening. An electronic thermometer will not work; it may cause an error. An alarm clock is needed to measure the temperature strictly at the same time. In this case, sleep should preferably last at least six hours.

The temperature should be measured in the morning, before you get out of bed, and recorded on the calendar.
Body temperature remains unchanged during the first period of the menstrual cycle. As soon as progesterone levels rise, the temperature will begin to decrease. This is a symptom of the imminent onset of ovulation. When the temperature rises by at least half a degree, it indicates the beginning of a favorable moment. It is better to start fertilization a few days before ovulation so that the sperm has time to reach the egg. If sexual intercourse occurs on the day of ovulation, the level of possibility of fertilization decreases.

SYMPTOMS AND DISCHARGE

Vaginal discharge also indicates the onset of ovulation.

During ovulation, vaginal discharge is clear and not particularly viscous, resembling egg white.
In other phases of the cycle they are cloudy and can be either liquid or thick.
At the end of menstruation, brown discharge may appear. This is completely normal, as the body gets rid of the remaining blood.

POSITION OF THE UTERUS

You can monitor the position of the cervix throughout the entire menstrual cycle. After all, its position changes all the time and can indicate the beginning of ovulation.

Check your cervix daily and note its approximate position and definition.
In the first period of the cycle, the cervix will be low. Approaching ovulation, the body prepares and the cervix becomes softer and slightly open for successful penetration of sperm.
Insert your finger into the vagina and you will feel like you are touching the opening of the cervix.

HORMONE LEVEL

Very often, with an irregular cycle, hormone tests are taken. However, such a method can also lead to false results. Initially, the test is taken approximately on the fifth day of menstruation. Then on the eighteenth day. However, the gap between cycles can be more than 40 days. And ovulation, for example, can occur on the 30th day of the cycle. In this case, the tests will not show a fertile day.

The most reliable and best method for determining ovulation during an irregular cycle is considered to be ultrasound monitoring the growth and development of follicles. The first ultrasound monitoring can be done on the 7-8th day of the cycle, the second - on the 12th day, and the last - at your own request or on the advice of your local doctor. The size of the follicle from 18 to 21 mm indicates the imminent onset of ovulation. In addition, thanks to ultrasound, you can find out whether the egg has been released and whether the follicle has burst. If the follicle bursts, it means that an egg has been released from it. And it is quite possible that fertilization has occurred. And if not, then there may be some problems with the ovaries. There is no need to worry too much, as modern medical treatment methods can eliminate such situations.

Having an irregular cycle, it is necessary to undergo examination under the supervision of a gynecologist.
If a disruption in the menstrual cycle occurs for the first time, do not rush to grieve. Even a woman with a healthy menstrual cycle can lose her cycle several times a year.
Sometimes you just need to lose weight or, on the contrary, gain weight, depending on your physique. It also wouldn’t hurt to take vitamins orally.
To determine ovulation, do not use calendars, calculators, mobile applications, or the Internet. After all, such methods are unable to take into account both objective and subjective circumstances.
Listen to your body. It will definitely give you signals.

In any case, don't be discouraged! The main thing is that you have a great desire to conceive a child, which means that you will soon become a happy mother!

How to determine ovulation if menstruation lasts for different times or sometimes comes after a month? Is it so important to determine it for conception? Answers to these questions can be obtained if you understand how to correctly create a menstruation calendar.

Irregular menstrual cycles can occur in any woman at any age. It may not form even from the very first menstruation. But if an unformed cycle does not have any dangerous health consequences, then this factor can negatively affect the conception of a child. It is important to know on what days the egg leaves the ovary. This period is considered successful for pregnancy.

What is ovulation

Ovulation is the only way for an egg to be fertilized by a man's sperm. The process of greatest fertility - ovulation, takes from 12 hours to 48 hours. Therefore, the time for the egg released from the ovary to meet with the sperm is quite short.

Due to the short ovulatory phase, it is important to know which day is most favorable for conception.

What is considered an irregular cycle?

An irregular menstrual cycle can signal diseases of the reproductive system, or be simply a feature of the body. To understand why it has ceased to be systematic, it is recommended to consult a gynecologist and endocrinologist.

The cycle becomes irregular if the periods between menstruation are different each time, it can be 35 days or 40 days. If it lasts 28-30 days, and sometimes another 2-5 days are added (with a long menstrual period of 33-36 days), then there are no deviations. But if a woman does not know when her next period may come, then this will be considered a serious deviation.

When it comes

In the body of a healthy woman, ovulation occurs in the middle of the cycle, that is, on days 13-14 in a 28-day cycle or on days 15-16 in a 30-day cycle. The percentage of conceiving a child on the day of the expected release of the egg during regular menstruation is approximately 60%.

If your cycle is irregular, how to determine ovulation

Conceiving with irregular ovulation is quite difficult. Even a completely healthy woman has problems in her body. With an irregular cycle, calculating a successful day for conception is quite difficult, but it is possible.

Determining the release of an egg from the ovary when menstruation is irregular is quite difficult. One of the simplest methods is tests that are sold in every pharmacy. You need to start doing these tests from the first day of your period, since with hormonal imbalances, the release of an egg can occur on any day.

The indicators may turn out to be false even if tested from the first day of menstruation. The result is influenced by a hidden illness or simple stress.

An effective way to calculate the day of ovulation is to determine your basal temperature. Its essence lies in the fact that before the ovulatory phase, due to the action of progesterone, body temperature decreases. And during its onset, the temperature increases by 0.5 degrees. You need to measure your basal temperature without getting out of bed every morning (preferably with a mercury thermometer). It is better to start sexual intercourse from the day the temperature rises, so that by the day of ovulation the sperm has time to reach the egg.

For amenorrhea

Amenorrhea is the absence of menstruation. It can be ovulatory or anovulatory. If anovulatory amenorrhea is diagnosed, it is impossible to conceive a child without treatment or IVF. With ovulatory amenorrhea, ovulation can be recognized:

by conducting tests;
measuring basal temperature;
monitoring vaginal discharge;
for hormone tests;

Cycle 22-25 days

With a regular menstrual period of 22-25 days, gynecologists recommend keeping your monthly calendar for six months. This will allow you to determine the onset of a good day for pregnancy two weeks before the onset of your next period. With a menstrual period of 22 days, it will occur on the 8-9th day from the start of menstruation.

Cycle 32-36 days

If the menstrual period is regular at 32-36 days, ovulation will occur on the 17-18th day from the start of menstruation. Such long periods of the menstrual period are extremely rare, but the possibility exists. As a rule, this feature is due to a hereditary factor, recent diseases of inflammatory pathogenesis.

Example

Regardless of the regularity of menstruation, the length of the first phase in a woman is individual, and the length of the second phase is often unchanged and lasts 14 days. But for a more accurate calculation, you need to know the first day of the last six menstruation.

Example:

The longest period is 40 days, and the shortest is 24 days. From the shortest period, the number 14 is subtracted - the first fertile day, and from the longest period the number 16, the end of the fertile period, is subtracted.

Calculation according to the table

To calculate the release of an egg, there are many tables in which data on the first day of the last menstruation, periods and duration of menstruation are entered. After which the exact day of ovulation is automatically calculated.

Period calendar

A woman can also keep a regular women’s calendar, focusing on her feelings, basal temperature measurements, test results and ultrasound. By marking the fertile and luteal phases with different colors, a woman independently calculates a successful day for conception.

Error

The error when calculating according to the table and calendar is 1-2 days, but this barrier can be overcome if you have sexual intercourse two days before the expected day of ovulation. Considering the fact that the viability of sperm is 72 hours, you can “insure yourself” in advance. Also, to be sure, you can undergo several tests at once, do an ultrasound to see the formation of the corpus luteum.

Your menstrual cycle can be irregular for a variety of reasons. One of the difficulties of an irregular cycle is calculating the period of ovulation. This is especially important if you are planning to conceive a child. The ovulation period is the most optimal time for the fertilization of an egg by a sperm. Ovulation lasts relatively short - only 12-14 hours. Therefore, it is very important to know exactly when it will occur. Keep in mind that an irregular menstrual cycle may be a symptom of some diseases and other problems that must be eliminated before conception. For example, this could be an ovarian cyst, early stage diabetes, or thyroid dysfunction. Therefore, before becoming pregnant, be sure to consult a doctor.

Steps

Monitor your body's condition

Measure your body temperature. Basal body temperature will help you understand when ovulation will occur. So take your body temperature every morning for several months to track when you ovulate. .

Watch your vaginal discharge. The stage of the menstrual cycle can be determined by the discharge from the vaginal mucosa. Hormonal fluctuations cause changes in the consistency and color of mucus. .

Monitor the condition of the cervix. The cervix is a small space between the uterus and the vagina. Throughout the menstrual cycle, the position and condition of the cervix changes, allowing you to understand when ovulation will occur.

Feel your cervix with your finger every day and remember the approximate location and internal relief to track changes.
During the first phase of the menstrual cycle, the cervix will be low. When the body begins to prepare for ovulation, the cervix softens, opens slightly and begins to contract to open the passage to the egg.
Place one or two fingers into the vagina a few centimeters, you will soon hit the cervix. You will feel the tip of your finger touching a small hole.
If you don't know how to feel the cervix,...

Check your hormone levels using a special test. An ovulation test measures luteinizing hormone (LH) levels. Right before ovulation, levels of this hormone rise. .

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