There are many reasons for half menstruation, which may be caused by endometrial polyps, or organic lesions of submucosal fibroids, which can be resolved by hysteroscopic polyp and fibroid removal. If it is abnormal ovulation, it may lead to dribbling and needs to be regulated by progesterone. If it is caused by eating foods that activate blood, such as brown sugar, rice wine, angelica and cinnamon, you need to stop using these foods to get relief. If the emergency contraceptive pill is taken, it is possible that the symptoms will not be relieved until the pill is completely metabolized in the body, which will take about 3 months. However, pregnancy may also cause abnormal bleeding, and you need to come to the hospital for relevant tests to make a clear diagnosis before deciding how to treat it.