It is normal to have no bleeding after taking the emergency contraceptive pill. The emergency contraceptive pill contains a large amount of estrogen and progesterone, which can cause withdrawal bleeding, irregular vaginal bleeding or delayed menstruation after taking the pill, which are all normal and related to the time of taking the pill and are side effects of taking the pill. If your period is delayed for more than 1 week and more than 10 days after taking the pill, you should use a pregnancy test or have a blood test for HCG to rule out pregnancy. If irregular vaginal bleeding or menstrual disorders occur during the observation period, they do not need to be treated and will return to normal naturally after 1-2 months. If the bleeding significantly exceeds the amount of menstruation or if the bleeding lasts for more than 10 days, you need to go to the hospital.