Early menstruation after taking Yutin is due to withdrawal bleeding. Pregnant Ting belongs to the emergency contraceptive pill, after taking this contraceptive pill, if the contraceptive pill is successful, there will be about seven days after stopping the withdrawal of bleeding. This withdrawal bleeding and the amount and timing of menstruation, so taking Yutin does lead to changes in menstrual conditions. This emergency contraceptive pill should not be used for a long time, if used repeatedly within a short period of time will lead to irregular menstruation, menstrual disorders and excessive menstruation. In a year at most can not use more than twice, usually to use condoms better, emergency contraceptive pills should be taken as little as possible.