Emergency contraceptive pills taken during the safe period, if taken once in a while, do not have a great impact on the health of the body. If there is no pregnancy, there will be a withdrawal bleeding, usually about a week after taking the emergency contraceptive pill, there will be bleeding similar to menstruation, bleeding time 3-5 days, withdrawal bleeding does not require special treatment. Emergency contraceptive pills can affect endocrine hormone levels, leading to the existence of menstrual irregularities, and repeated use can affect the normal future pregnancy and childbirth. There is no absolute clinical safety period, and if there are no plans to prepare for pregnancy in the near future, regular contraceptive measures should be done. The use of a safe period contraceptive method can lead to unintended conception, and if the emergency contraceptive pill is taken next time, it may interfere with normal future pregnancy and childbirth.