How to budget women's menstrual cycle?

It is a complete menstrual cycle from the first day of menstruation to the first day of the next menstrual cramp. In general, this cycle is calculated in one month, but it actually varies from person to person. Here I want to explain the safety period theoretically, so it is calculated according to one month. In this menstrual cycle, there are roughly the following situations: First, menstrual period, usually about a week, pay attention to the word left and right, the length of menstrual period varies from person to person, not necessarily a week. After the menstrual period, enter a normal period without bleeding. About a week later, ovulation came. Ovulation is a physiological phenomenon of normal women of childbearing age every month, which is to prepare for pregnancy and reproduction. Ovulation is the easiest day to get pregnant in a menstrual cycle, which is what many people call the most dangerous day. Ovulation is actually only a moment, but the activity of this egg cell in the body is relatively slow, so it may survive in the female body for about 2 days before it dies and is absorbed, so it is possible to get pregnant in these days of ovulation. If the egg is not fertilized, it will die and be absorbed by the human body. After about 2 weeks, the next menstruation came again, which happened to be 4 weeks. This is a menstrual cycle.

Therefore, in addition to ovulation and menstrual period, in theory, unprotected sex can be carried out at other times without pregnancy. The so-called safety period, but this is purely theoretical. Many people simplify it to one week before and after menstruation or two or three days before and after menstruation. Unfortunately, there are various factors that change menstrual cycle and ovulation in real life, so the safety period is absolutely unsafe:

First, the menstrual cycle, many women's menstrual cycle is not necessarily accurate, which brings difficulties to the calculation of ovulation period. Although we can generally rely on "the first 14 days of the next menstruation" to calculate, there are further factors that make this calculation unreliable, that is, ovulation is too complicated and there are too many influencing factors, such as weather changes, environmental changes, changes in residence, emotional changes and so on. Some women may ovulate when they are very excited, so ovulation is unpredictable. It is precisely because of the uncertainty of ovulation that the safe period is unsafe, because you don't know when you will ovulate. Maybe just when you think it's safe, your sexual partner will ovulate because of some slight factor. This may even happen when menstruation has just ended or is coming.

So once again: the safety period is absolutely unsafe.