If you are taking emergency contraceptive pills, it is normal to bleed after taking the pills because emergency contraceptive pills contain a large amount of progesterone, which will cause withdrawal bleeding, which is a normal drug reaction. Retreating bleeding usually occurs about one week after taking emergency contraceptive pills, and the amount and duration of bleeding is usually less than or may be equal to the amount of menstruation. Retreating bleeding can be regarded as a menstrual period, and the time of the next menstrual period is projected according to the time of this bleeding, or some people do not have retreating bleeding. Emergency contraceptive pills have a lot of side effects, the main thing is that it will affect menstruation, you can’t take it often, usually not more than three times a year, if you don’t intend to get pregnant you should pay attention to good contraceptive measures to prevent unwanted pregnancy. In the treatment of medication must follow the doctor’s instructions, rational application of drugs, do not arbitrarily use the drug, to avoid causing serious side effects as well as adverse reactions.