A woman’s egg usually survives in her body for a maximum of 48 hours or 2 days after ovulation, and sperm can survive for 2-3 days. A mature egg is the basic condition for pregnancy, so having sex three days before and after ovulation is the period with the highest probability of pregnancy. As long as the ovaries are functioning normally, the fallopian tubes are open and the environment of the uterus is suitable, the conception rate is generally high. If you have had normal sex for more than a year without pregnancy, you should go to the hospital to find out the cause.