The emergency contraceptive pill is generally used after unprotected intercourse and is effective as long as it does not exceed 72 hours. Oral contraceptive pills can be taken once, but only 72 hours beforehand, and not more than 12 hours afterwards. Long-acting contraceptive pills are taken orally only once or twice to achieve the effect of contraception for a month, but long-acting contraceptive drugs, because the oral is absorbed by the gastrointestinal function, the dose of the drug will be stored in fat and tissue, slowly released, to play the role of long-acting contraception. However, there may be a large number of side effects, causing a certain early pregnancy reaction menstrual disorders, etc. Clinically, it is not recommended to use long-acting contraceptives. The emergency contraceptive pill also has certain side effects, causing withdrawal bleeding and early or delayed menstruation, but such adverse reactions do not occur in everyone.