Risk of pregnancy during safe period

summary

Safe period is a traditional contraceptive method, which is one of the most commonly used contraceptive methods at home and abroad before the advent of oral contraceptives and intrauterine devices. However, a lot of men and women in desire are "caught" during this period. I said the probability of pregnancy in the next safe period

Risk of pregnancy during safe period

First of all, the birth of new life begins with the combination of sperm and egg. In order to achieve the effect of contraception, we must try every means to prevent their meeting. The strategy of safe period contraception is to calculate the appearance time of the egg and the possible fertilization time, and let the sperm avoid these time to come out again.

Secondly, the annual failure rate of safe period contraception is about 5%, which is less reliable than condom and oral short acting contraceptive. In fact, it is difficult to control the failure rate at 5%. If a simple calculation method is used, or the physiological cycle is irregular, the failure rate will be greatly increased, and the annual failure rate of clinical follow-up can reach more than 25%. The 25% failure rate means that 100 adult women use this method of contraception, and within one year, 25 women will become pregnant.

The principle of the final safety period sounds very reliable, but in fact the so-called ideal state does not exist, so it will face many difficulties in calculation.

matters needing attention

In order to reduce this error, there are also some more accurate calculation methods of safe period, such as Ogino formula. In this method, the menstrual cycle of the last 6 to 12 months should be recorded, and the longest and shortest cycle values should be selected as important parameters to calculate the safety period. Menstrual cycle is defined from the first day of menstruation to the day before the next menstruation.