There is no authoritative information on the contraceptive success rate of the emergency contraceptive pill during ovulation. Emergency contraceptive pills (ECPs) are used by women as an emergency remedy after unprotected sex. There is no authoritative information on the contraceptive success rate of the ECP. The main ingredient of the emergency contraceptive pill is levonorgestrel, which is mainly used to achieve the purpose of contraception by inhibiting ovulation and preventing the fertilized egg from implanting. In principle, the emergency contraceptive pill is taken within 72 hours after intercourse, but the earlier the time, the better the contraceptive effect. Two hours before and after taking the pill, try not to eat anything to avoid affecting the contraceptive effect of the pill. Since women are ovulating, the success rate of contraception at this time compared with the usual, there is a relative decline in the situation. However, because each person’s situation is different, so about the specific ovulation emergency contraceptive pill contraceptive success rate, there is obvious individual variability, can not be generalized. All in all, if both parties do not have the intention to have children for the time being, they must take effective contraceptive measures in their sex life.