If it is an emergency contraceptive pill, it needs to be taken within 72 hours after intercourse, the earlier it is taken, the higher the success rate of contraception. If it is an ordinary short-acting contraceptive pill, such as Daimler-35, Mafron, Eusebio, Eusebio, etc., it is generally recommended to take it within the second to fifth day of menstruation. If taken after the fifth day of menstruation, it is possible that the follicles have already been raised, in which case taking the pill may not achieve the purpose of contraception and may cause contraceptive failure. In addition, for the contraceptive pill mifepristone can be taken within 120 hours after intercourse, mifepristone to achieve the role of contraception, the success rate is also relatively high, also the earlier you take, the higher the success rate of contraception.