Pain in the abdomen after taking the emergency contraceptive pill is not necessarily caused by the emergency contraceptive pill. If the pain in the abdomen is more severe, it is recommended to go to the hospital for ultrasound examination to check whether there is pelvic inflammatory disease, adnexitis or appendicitis, etc. If you experience abdominal pain similar to menstruation within a week of taking the emergency contraceptive pill, you may be about to experience withdrawal bleeding, which is a relatively common adverse reaction to the emergency contraceptive pill. The emergency contraceptive pill contains a large amount of progestin, which may cause the endometrium to shed within a week after taking the pill, resulting in vaginal bleeding. The emergency contraceptive pill may also cause gastrointestinal symptoms such as nausea and vomiting. The emergency contraceptive pill can only be used as a remedy and should not be taken on a regular basis.