After taking emergency contraceptive pills generally bleed for 3~5 days, but the specific bleeding time also exists some difference. Emergency contraceptive pills contain a large number of estrogen, progesterone, a few women in the emergency contraceptive pills about 1 week after eating, due to changes in hormone levels in the body, may lead to withdrawal bleeding, causing vaginal bleeding phenomenon. The bleeding time is mostly 3 to 5 days, and even sometimes a week before it can be clean, and the amount of bleeding and the usual amount of menstruation is almost the same, do not need special treatment, and mostly indicates the success of contraception. If women take emergency contraceptive pills after the withdrawal of bleeding, continued for a longer period of time, especially more than a week or more, is an abnormal phenomenon, it is recommended to consult a doctor in a timely manner.