The bleeding that occurs after taking the pill is generally not related to whether or not you are pregnant. The bleeding caused after taking the pill is drug-induced withdrawal bleeding, which occurs when the progesterone level in the body suddenly decreases after the high dose of progestin is consumed and the endometrium cannot maintain its integrity for a few days after stopping the pill. If ovulation has already occurred, it can prevent the fertilization of the egg, depending on the timing of the patient’s menstrual cycle at the time. If ovulation has already occurred, it may interfere with the fertilized egg’s implantation. However, the emergency contraceptive pill is not effective in all cases, and the only way to see if the patient is pregnant is to wait until the time when the patient is supposed to have her period to see if there is a menstrual flow. If the period does not come, it is highly suspected that it is not pregnancy.