The side effects of the pill vary with each person’s constitution and the duration of the side effects can be different. Some people do not have any side effects after taking the pill, but some people can have disrupted menstrual cycles for up to 3 months after taking the pill. Sometimes it may also cause abnormal bleeding, also known as withdrawal bleeding. It can also cause early or delayed menstruation, which usually returns to normal after 3 months. If this happens for a long time, it is recommended to go to the hospital for a blood test for endocrine hormones, because the pill itself is hormonal and may cause changes in the endocrine hormones in the body, which may cause abnormal menstrual cycles. You can regulate your menstrual cycle according to the situation. When abnormal bleeding occurs, take oral anti-inflammatory and hemostatic drugs as much as possible to help reduce inflammation and stop bleeding so as not to cause infection for a long time.