Perhaps a lot of people know that women are not pregnant when they are in a safe relationship, so the safety period of contraception has become the best method of contraception for many people who don't want to wear condoms. But when is the woman's safe period? In fact, the so-called security index is not the time of ovulation in women, to 1 times each menstrual normal women of childbearing age each month, from the beginning to the next menstruation menstruation first days, called 1 menstrual cycles.
However, between the menstrual cycle, there will be a time of ovulation, in the time of ovulation, it is called "non security period", also known as the "dangerous period", this into the room, then the probability of pregnancy is 100 percent. On the other hand, avoid the period of ovulation, and the rest is safety. The correct calculation method for female security period is as follows:
From the point of view of contraception, each menstrual cycle of women can be divided into menstrual period, ovulation period and safety period. In general, women of normal child-bearing age have only one egg per month. Eggs can survive 1 to 2 days, the sperm in the female genital tract survived for 2 ~ 3 days after ovulation, fertilization ability in 24 hours, more than 2 ~ 3 days of sperm and egg loses the ability to combine.
Therefore, 2~3 days before ovulation and 1~2 days after ovulation, it is possible to conceive. This period is called "easy pregnancy" or "dangerous period". Oviposit date of the female general in the next 14 days before menstruation. To be on the safe side, we call ovulation the first 5 days and 4 days after ovulation, including 1 days of ovulation, including ovulation. The rest of the period other than the menstrual period is called a safe period.
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