Taking the emergency contraceptive pill, in general, affects menstruation for 2-3 months. The sensitivity of the emergency contraceptive pill is different for each person. Some people may experience withdrawal bleeding after taking it, but will be able to return to normal by the time they have their next period. Some people are very sensitive to the pill and may experience irregular vaginal bleeding or menstrual disorders, but most people return to normal after three months. Emergency contraceptive pills cannot be used as a regular contraceptive measure because they can cause endocrine disorders, which manifest themselves as irregular vaginal bleeding, and they mainly work to inhibit ovulation and disturb the normal environment of the endometrium, which is why they can be used as a contraceptive. For people who do not want to have children, they need to use other contraceptive measures.