Level 1: Function and use of emergency contraceptive pills Emergency contraceptive pills are an emergency contraceptive measure that can be taken within 72 hours after sexual intercourse, thereby reducing the risk of pregnancy. Generally speaking, there are two types of emergency contraceptive pills: oral emergency contraceptive pills and intrauterine devices. Oral emergency contraceptive pills need to be taken as soon as possible after sexual intercourse to increase their effectiveness. The IUD needs to be inserted within 3-5 days of sexual intercourse. If you want to use emergency contraception, be sure to read carefully