What is the probability of pregnancy during the safe period?

　　female The ovulation date is generally about 14 days before the next menstrual period. Counting from the first day of the next menstrual period, the 14 days countdown or minus 14 days is the ovulation day. The ovulation day and the 5 days before and 4 days after the ovulation are called the ovulation period. In addition to the ovulation period, there is also the safe period. From the perspective of contraception, a woman's month can be divided into menstrual period, ovulation period and safe period.

　　If you want to have a child, it is best to have intercourse during the ovulation period, so that the chance of conception will be greater. If you do not want a child, it is best to have intercourse during the safe period, but you should also take some contraceptive measures, because you will still get pregnant during the safe period.

　　The safety period is divided into a safety period before ovulation and a safety period after ovulation. The period from the day of menstruation to the day before ovulation begins is the period before ovulation. From the first day after ovulation to the day before the next menstrual cramps is the safety period after ovulation. Generally speaking, the safety period after ovulation is safer than the safety period before ovulation. This is because some women sometimes ovulate early due to environmental changes and mood swings, which shortens the safe period before ovulation without them knowing it, making the safe period before ovulation less safe. The chance of the ovary ovulating twice in one menstrual cycle is very rare. That is, the second time of ovulation usually does not occur between ovulation and the next menstrual period. Therefore, the safety period after ovulation is relatively safe.

　　Contraception during menstruation is only suitable for couples with regular menstrual cycles, long-term cohabitation, regular lifestyles, and mutual cooperation and understanding. However, due to its low safety, if you want to use this method for contraception, women should pay attention to the following points:

　　1. many disease It will change the ovulation time of women, such as endocrine diseases, kidney diseases, etc. If you use the "safety period" for contraception during this period, it can often lead to contraceptive failure. ；

　　2. Having sex during menstruation generally does not lead to pregnancy, but there is a possibility of accidental ovulation, and sex during menstruation can easily cause infection, which is harmful but not beneficial.；

　　3. If you are in menopause Women of menstruation age, when there is still a small amount of vaginal bleeding, should not have sex until the fourth day after the bleeding stops, because this kind of bleeding may be caused by ovulation.；

　　4. If you switch from oral contraceptives to menstrual period contraception, you may experience extra ovulation or irregular menstruation in the first few months after stopping taking the contraceptive pill, so you should try not to use safe period contraception in these months.