The contraceptive pill mentioned here should be the emergency contraceptive pill, the side effect of which is the occurrence of irregular vaginal bleeding. The vaginal bleeding that occurs a week or so after taking the pill is progestin-induced withdrawal bleeding, which usually lasts for about 3-5 days, not more than 7 days, and is basically the same as the patient’s usual menstrual volume and period. Of course, depending on the time of taking the medication, the symptoms of withdrawal bleeding after taking the medication are not exactly the same, and may only be manifested as a small amount of bleeding or bloody discharge. If the amount of bleeding is the same as the amount of menstruation, it can be treated as a menstrual flow and can stop on its own without special treatment. If the amount of bleeding is significantly less than the usual amount of menstruation and the duration of bleeding is significantly shorter, it cannot be considered as a menstrual period and a blood HCG test should be done around 7-10 days after stopping the pill to determine if you are pregnant. Irregular vaginal bleeding that occurs after taking the emergency contraceptive pill usually takes 3 menstrual cycles before it returns to normal.