The harm of taking the emergency contraceptive pill during the safety period is the same as that of taking it normally, there are the following points: 1, abnormal vaginal bleeding, is one of the most common side effects of taking the emergency contraceptive pill. Emergency contraceptive pills have high hormone content, and the hormone level in the body increases rapidly after taking them, and vaginal bleeding occurs after withdrawal, which lasts no more than seven days, and the amount of bleeding is about the same as the usual amount of menstruation, which generally does not require treatment. When the bleeding time is long and the amount of bleeding exceeds the amount of menstruation, it is necessary to take hemostatic drugs.2. Gastrointestinal discomfort, nausea, vomiting, loss of appetite and other early pregnancy reactions may occur, but the symptoms may disappear after the drug is completely metabolized.3. Endocrine disorders, which may cause the loss of the original regularity of menstruation, such as early menstruation, delayed menstruation and incomplete menstruation. Some of them can affect three menstrual cycles after taking one emergency contraceptive pill.