Aunt generally refers to menstruation, the probability of getting pregnant just after menstruation is not statistically possible, and often has a great deal to do with whether the menstrual cycle is regular or not. 1. Irregular menstruation: it is impossible to calculate the ovulation period, some women may ovulate 2 to 3 days after the end of menstruation, which will lead to increased chances of pregnancy; if a woman’s menstruation is delayed, ovulation will also be delayed at this time, in this case, after the period of coitus caused by the chances of pregnancy are relatively low. 2. Regular menstruation: this part of the women’s menstrual period is generally 28 to 30 days, the normal ovulation belongs to the first day of menstruation to start counting, counting down to 14 days is the day of ovulation, the day of ovulation, the first 5 days and the last 4 days together is called the period of ovulation, and the end of menstruation is not in the case of ovulation, so the chances of getting pregnant is relatively low. In order to be safe, in order to avoid accidental pregnancy, it is recommended that women need to take safety measures when having sex after menstruation.