The premise of pregnancy is that the sperm and the egg meet to form a fertilized egg, and women only ovulate once in a menstrual cycle, the ovulation period is relatively fixed, for the regular menstrual cycle of women, it is in the next menstrual period before the onset of 14 days or so, generally speaking, the egg discharged in the body can survive for 24 hours, and the sperm enter the body of the woman can survive for 72 hours or so, so the chances of getting pregnant before and after the ovulation period is very high, and avoiding this period of time does not necessarily mean that you will be able to get pregnant. The chances of conception are very high when you have intercourse before or after ovulation, and you will not necessarily get pregnant if you avoid this period of time. However, the ovulation period is affected by many factors, such as environmental changes, mood swings, etc., may lead to the emergence of early or delayed, so in the non-ovulatory period when intercourse, there is also the possibility of conception, so it is recommended that if there is no plan for pregnancy, intercourse to take effective contraceptive measures, such as condoms, short-acting contraceptive pills, etc., if an intercourse did not take safety measures, you can consider oral emergency contraceptive pills, although the side effects are relatively high, but the number of people who can’t afford to pay the price. Although the side effects are relatively large, but for contraception is also feasible.