Eggs survive for about 12-48 hours after ovulation. Eggs, the female reproductive cells, are produced by the ovaries. A normal woman is able to expel one mature egg each month. The egg usually survives in the reproductive tract for 12-48 hours after discharge, with a higher ability to fertilize within 24 hours of ovulation, while sperm can survive for 2-3 days after entering the female reproductive tract. Therefore, if a woman has sex during ovulation, the fertilization rate is higher. If a woman has a regular menstrual cycle, her ovulation date is about 14-16 days before the next menstrual period. The five days before and the four days after the day of ovulation are known as the ovulation period. If a woman wishes to become pregnant, she can increase the frequency of intercourse during this phase in order to increase her chances of conception. The survival period of the egg is shorter after ovulation, so if a woman is willing to give birth, she can use ovulation test paper or other means to calculate the date of ovulation in order to increase her chances of conception.