Bleeding caused by birth control pills, both short-acting contraceptive pills and emergency contraceptive pills, is a possibility, mainly because the most common side effect of short-acting contraceptive pills is to cause irregular vaginal bleeding, which will be relieved in the vast majority of patients after continuing to take the pills. However, due to individual differences, some people continue to take the pill after the corresponding bleeding has not been relieved, in the clinical need to be given symptomatic treatment, such as can be used to stop bleeding drugs. Bleeding when taking emergency contraceptive pills, mainly in the first half of menstruation, often leads to withdrawal bleeding after stopping the pill, this bleeding is far less than the amount of menstruation, and will not cause other symptoms, after 3-5 days or so this withdrawal bleeding will be cleaned up by itself, mainly caused by the side effects of the drug.