There are many different methods of emergency contraception, and you can choose the right one for your situation. Emergency contraception means having sex without contraception or having contraception but it fails, such as a slipped or broken condom, and also involuntary sex, a remedy to prevent unwanted pregnancy. The most common clinical practice is the use of emergency contraceptive pills. Commonly used emergency contraceptive pills are levonorgestrel tablets, mifepristone. It is indicated for sexual intercourse without contraception within 72 hours. The earlier the pill is taken, the higher the success rate of contraception. The most commonly used is levonorgestrel, a strong progestin that inhibits ovulation and prevents fertilization of the egg, while thickening the cervical mucus and preventing sperm penetration. Mifepristone is not as effective as levonorgestrel, and it usually needs to be taken within 24 hours after intercourse. Another contraceptive measure is the intrauterine device (IUD), which is usually placed 3-7 days after menstruation but can be placed within 5 days of intercourse when used for emergency contraception. In short, the earlier the emergency contraception is handled, the safer it is. Clinically, levonorgestrel is still the main method, and the success rate of contraception can reach 90%.