The main component of the emergency contraceptive pill is the highly effective progestin. After taking the highly effective progestin, the main contraceptive mechanism is to inhibit ovulation and cause abnormal thickening of the endometrium, which prevents the fertilization of the egg, thus achieving the purpose of contraception. It is recommended not to use emergency contraceptive pills as a regular contraceptive method in daily life, because the progestin contained in emergency contraceptive pills is very high, which can damage liver function and kidney function, and can also clinically lead to endocrine disorders, and menstrual disorders, menstrual disorders or irregular vaginal bleeding. Therefore, it is advisable to use condoms for contraception and, if pregnancy is not planned for a long period of time, it is better to use an IUD for contraception.