How is a woman's safe menstrual period calculated?

So far, many newlywed young couples have no intention of having children. Therefore, when it comes to safety issues, you must pay attention to calculating the safe period. So far, many couples are trying hard to prepare for having children, so they must try outside the safe period. This shows that calculating the safe period is very important. This is something that all married couples will care about. So today I will explain to you how to calculate the safe menstrual period for women.

How does the safe period come about?

The birth of new life begins with the combination of sperm and egg, and in order to achieve the effect of contraception, we must find ways to prevent their meeting. The strategy adopted for safe period contraception is to calculate the time when the egg appears and the possible time of fertilization, and let the sperm avoid these times before coming out to move.

There are some rules in the process of ovulation and fertilization. Generally, healthy women will ovulate regularly every month. For a woman with a 28-day menstrual cycle, ovulation occurs roughly 14 days before the onset of menstruation. The egg can survive for 1 to 2 days after being released, while the sperm can survive for about 3 days after entering the female vagina. According to these rules, we can roughly determine the "dangerous period" when pregnancy is easy through women's menstrual cycle, and the rest of the time is the so-called "safe period". Under "ideal conditions", having sex during the safe period will not allow sperm and egg to meet, thus achieving the contraceptive effect. s_3136

Calculating the safe period is more complicated than you think

Calculate the safe period accurately, basically rely on luck

The principle of the safe period seems to be quite reliable, but in fact the so-called ideal state does not exist, so it is very difficult to calculate. The safe period calculation method we often hear is a simple estimate like "seven before and eight after" or "three before and four after", but it is only calculated based on the most recent menstrual cycle. For such an algorithm to be accurate, women's menstrual cycles must always be as punctual as a clock. In fact, not all women ovulate regularly. Even for women who ovulate regularly, their menstrual cycles will fluctuate due to the environment, emotions, and health conditions, making it difficult to ensure that they are completely on time. Therefore, such calculations will lead to large errors.

In order to reduce such errors, there are also some relatively more accurate methods for calculating the safe period, such as the Ogino formula. This method requires recording the menstrual cycles of the last 6-12 months, and selecting the values ​​of the longest and shortest cycles as important parameters to calculate the safe period. The menstrual cycle is defined as the period from the first day of menstruation to the day before the next menstrual period.

This method is more reliable than simple estimation because it appears to smooth out the fluctuations of the cycle by using the longest and shortest values ​​in multiple cycles. But it is very troublesome to use, and even so it cannot escape the influence of uncertainties, and calculating the cycle accurately is almost a low-probability event. Relying on periodic contraception basically relies on luck and character. In addition, some other factors may also affect the calculation of the safe period. The safe period is generally calculated based on the menstrual cycle observed by women themselves, but in fact vaginal bleeding is not necessarily true menstruation, it may also be other situations such as ovulation bleeding. If non-menstrual bleeding is mistakenly calculated as menstruation, the safe period calculation will also be inaccurate.

I have already taught you how to calculate a woman's safe menstrual period. I hope it can be helpful to couples who do not want children or couples who very much want children. Of course, this method of calculation is not completely absolute. Sometimes various factors in life can cause changes in a woman's body, leading to the movement of the safe period. I hope everyone can also pay attention to this point. After all, nothing is absolute.