You can treat withdrawal bleeding as a menstrual flow and observe the amount of bleeding. If the amount of bleeding is the same as the usual period and the time is the same, this condition is normal. If the bleeding is very little, not the same as the usual period, and always very little, rule out the possibility of pregnancy. If the withdrawal bleeding is caused by taking the emergency contraceptive pill, it is suspected that the emergency contraceptive pill did not work because very few women still have pregnancy after taking the emergency contraceptive pill. If you have a small amount of vaginal bleeding when it is time to have your period, check to see if you are pregnant and if not continue to observe the bleeding.