The reactions after taking the emergency contraceptive pill are not the same among different individuals. The common reactions include: within the first 24 hours of taking the pill, patients may have headache, dizziness, weakness, nausea, vomiting and other symptoms; some patients have a small amount of vaginal bleeding about 3-5 days after taking the pill, and may also experience breast pain and discomfort; most women will have a significant amount of withdrawal bleeding similar to menstruation after taking the pill. Most women will have significant withdrawal bleeding after taking the pill, which can be treated as a menstrual period. In order to reduce and avoid physical discomfort caused by the emergency contraceptive pill, try to arrange to take the emergency contraceptive pill at night before going to bed, and if vomiting occurs within two hours of taking the pill, you should take a refill.