Ejaculation within the ovulation, the possibility of pregnancy is very high, as long as the bilateral fallopian tubes are clear, function well, and the thickness of the uterine lining is also appropriate, can cause pregnancy. However, not all sex during ovulation can cause pregnancy, the pregnancy rate can reach about 50%. There are many reasons for not getting pregnant. If there are no other diseases, it is best to use emergency contraceptive pills to prevent pregnancy if there is no physiological requirement for intercourse during ovulation. If the pregnancy is unplanned, you need to have an abortion, the damage to the body and the uterine lining is more serious.