If you take the emergency contraceptive pill during ovulation, it will work 80% of the time, so there is an 80% chance that you will not get pregnant. Because the emergency contraceptive pill is not 100%, there is also a certain chance of failure. After taking oral contraceptives, you can buy an early pregnancy test about 12 days after intercourse to rule out the possibility of pregnancy. If the test is negative, it means that the pill has worked well and there is no conception, so you can wait patiently for your period. There are also some women who may have adverse reactions to the pill, which may cause early or delayed menstruation, so it is important to observe this. If the test is positive, it means that the pill is not effective, so it is time to terminate the pregnancy by means of medical abortion or abortion.