Taking emergency contraceptive pills for 2 months in a row will cause endocrine disruption and prolonged anovulation, menstrual disorders and irregular vaginal bleeding. Emergency contraceptive pills are highly effective progestins, which mainly inhibit ovulation and disrupt the normal endocrine state to change the normal environment in the uterine cavity, so that they can play a contraceptive role. Generally, it can only be taken once a month, and it will take about 2-3 months for menstruation to return to normal, and if it is taken for 2 consecutive months, it will take about 4-6 months for menstruation to return to normal. It may also cause prolonged damage and irregular menstruation, which may have an effect on future fertility.