When to take contraceptives

Emergency contraceptives need to be taken within 72 hours after the same room, 72 hours can be effective contraception, generally speaking, the earlier the time to take, the better the contraceptive effect, but the contraceptive is not 100% contraceptive, there is the possibility of contraceptive failure, if menstruation is delayed, it is best to do pregnancy testing 14 days after the same room.