When you ejaculate internally during sex, there is a possibility of pregnancy. If you have sex during ovulation, the chances of pregnancy are even greater. The semen enters the vagina and the sperm moves to the fallopian tubes to unite with a mature egg to form a fertilized egg, which returns to the uterus to settle and complete the pregnancy. Even if you do not have sex during ovulation, you still have the possibility of getting pregnant. Therefore, if you do not want to have an unwanted pregnancy, it is recommended to take the oral emergency contraceptive pill within 72 hours of having sex to remedy the situation. However, it should be noted that the emergency contraceptive pill has large side effects and should only be used as a remedy for emergencies and should not be taken always. Usually it is better to do a good job of reasonable contraceptive measures, such as wearing condoms throughout the safer and more effective.