The emergency contraceptive pill is effective during ovulation. Although the egg is already ovulated at the time of ovulation, the emergency contraceptive pill contains high doses of progestin that can interfere with fertilization, which means that it can interfere with the union of the sperm and the egg, thus preventing pregnancy. In addition, even if the sperm and egg have already united, the emergency contraceptive pill can interfere with the fertilized egg’s implantation in the uterine cavity because the high dose of progestin, when consumed, interferes with the changes in the endometrium, thus causing the endometrium and the fertilized egg to develop out of sync, which can prevent the fertilized egg from implanting. So although it is during ovulation, taking the emergency contraceptive pill still has an effect, and it is best to take it as early as possible for better results.