It is best to take emergency contraceptive pills during the safe period. Safe period generally refers to the time outside the ovulation period of a woman, relatively speaking, if you have sex during this period, the incidence of pregnancy is relatively low. However, women’s ovulation is affected by a number of factors, such as recent work and study stress; environmental changes, moving from one city to another; mood, depression, all of these will affect women’s ovulation. Due to such reasons, so women’s safe period is not safe, some women will have ovulation during the safe period, so when intercourse occurs during the safe period, it is also necessary to take contraceptive pills, so as to avoid the occurrence of pregnancy. In the future, try not to use emergency contraceptive pills, because it is not a regular contraceptive method, it is best to use condoms or oral short-acting contraceptive pills.