How to calculate ovulation?

If you and your partner are trying to have a baby or, on the other hand, are careful not to get pregnant, you have probably already come across the topic of ovulation and so-called fertile days. We will advise you on how to calculate ovulation from the calendar as well as other methods to find out which days are best for conception.

What does ovulation and fertile days mean

Ovulation represents a milestone in the context of a woman’s fertility. It is the period when the release of a mature egg from the ovary occurs, which usually comes in the middle of the menstrual cycle. It is closely related to fertile days, the time interval during which a woman has the best chance of becoming pregnant.

The highest fertility usually comes 2-3 days before ovulation and 1-2 days after ovulation. Unlike ovulation, which is only one day, there are five fertile days. The remaining days are termed as infertile or less fertile. And the lowest fertility is associated with the menstrual cycle.

You can calculate the approximate date of ovulation yourself at home, how to do it? The key is regular menstruation and a menstrual calendar. You should record all three phases of your cycle in your menstrual calendar:

  • follicular – begins on the first day of menstruation and is a precursor to ovulation, there is only a small chance of conception in this phase and it usually lasts 13-18 days,
  • ovulation – you will experience a  it usually in the middle of the cycle,
  • luteal – starts on the day of ovulation and ends on the first day of menstruation, gradually over the days the level of estrogen in the blood drops and lasts 12-16 days.

You should keep a menstrual calendar for several months. This is because the more records you have, the more accurate your ovulation calculation will be, as you gain a better understanding of your body over a longer period of time.

How to calculate ovulation from a calendar

Probably the easiest way you can calculate ovulation yourself at home is by using a menstrual calendar. However, you can never be completely sure of the results – the human body is not a machine and few women have a truly regular menstrual cycle, and regularity is crucial.

The previous paragraphs have already mentioned that ovulation typically comes in the middle of the cycle. It follows that it always depends on the length of the menstrual cycle. Thus, for a cycle that typically lasts 28 days, ovulation usually comes on the 14th day, with fertile days between the 11th and 15th. In a twenty-two day cycle, ovulation occurs on the 11th day, with fertile days between the eighth and twelfth, etc.

ovulation calculator

Source: PixabayIn the case of using a menstrual calendar, you can calculate ovulation by subtracting twenty from the number of days of the shortest cycle to give you the first fertile day, and then subtracting ten from the number of days of the longest cycle to give you the last fertile day. Alternatively, menstrual calculator.


Calculating ovulation and measuring basal temperature

Another, somewhat more sophisticated method to calculate ovulation is to measure basal temperature. You should always take your basal temperature at the same time, immediately after waking up. Before ovulation, the temperature ranges around 36.3°C – 36.7°C. Before ovulation, the temperature drops and then rises again by about 0.5 °C. You can measure your basal temperature either in your mouth or in your vagina.

Monitor your cervical mucus

In addition to basal temperature, you can also monitor changes, on your body. Approaching ovulation is associated with thinner, watery or transparent cervical mucus, which often remains on toilet paper or underwear. Outside of fertile days, cervical mucus is barely visible.

Buy an ovulation test

A quicker way to find out the date of ovulation is to take an ovulation test, which responds to the increased luteinizing hormone that appears before ovulation. You can buy the test in pharmacies and drugstores. Use your morning urine for testing.

Two stripes on the ovulation test indicate fertile days and with a positive result. A negative result – infertile days, you will know by one stripe or two, but the test one will be lighter. If the test is judged invalid, no stripe will appear in the control area.

Visit the doctor

The surest way you can find out when you’re ovulating is to visit a doctor to have an ultrasound. An ultrasound involves looking at the follicle, the formation that forms the future egg, and the layer of supporting cells that serves as the envelope.

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