After taking the emergency contraceptive pill, more than 80% of women may experience withdrawal bleeding 3-7 days after taking the pill. Because the emergency contraceptive pill is a remedial drug with a high potency progestin, it may act on the uterine lining, resulting in localized shedding of the uterine lining and causing a small amount of bleeding, which can also be called withdrawal bleeding and is usually a side effect of the drug, but about 20% of women may not experience this bleeding. The effect of emergency contraceptive pills on the uterine lining varies from person to person, and not every woman who takes them will experience withdrawal bleeding. And even if withdrawal bleeding occurs, it doesn’t mean that the contraception is successful, and there is a chance that it may fail. It is best to use test paper or pregnancy test 12 days after intercourse to rule out the possibility of pregnancy.