There are many types of emergency contraceptive pills, but they are mainly used when you are not taking any contraceptive measures during sex or when contraception has failed and you need to take some method to prevent pregnancy. The emergency contraceptive pill can be used to reduce the chance of pregnancy. There are many types of emergency contraception. The first type of single-sided progestin contraceptive pill, which includes Yutin, levonorgestrel, etc. The second type of anti-progestin, such as mifepristone, can also be used as a contraceptive. The emergency contraceptive pill is simple to take and only requires that the contraceptive pill be taken within 72 hours of having sex to increase the probability of contraception. Some patients may experience mild adverse reactions such as nausea and vomiting, which are common side effects. In order to prevent the formation of irritating effects on the intestinal tract, it is recommended to take the medicine on an empty stomach or about two hours after eating a meal.