Withdrawal bleeding from emergency contraceptive pills is not menstruation. Vaginal bleeding occurs within 1 week after taking emergency contraceptive pills and is a common effect of emergency contraceptive pills. Oral emergency contraceptive pills are mainly to inhibit ovulation, bleeding indicates the success of contraception, withdrawal bleeding and menstrual bleeding is similar to the amount of bleeding, bleeding time within 1 week after stopping the pill, but some patients bleeding time is longer. Emergency contraceptive pills contain high levels of estrogen, which can easily lead to menstrual cycle disorders in women, so it is normal to have withdrawal bleeding after taking the pill. However, women should be careful not to take more than one, and can only take emergency contraceptive pills up to 3 times a year, if they take more than one, it may affect their fertility in the future.