If an egg is not fertilized within 12-48 hours after ovulation, it will lose its ability to fertilize and die naturally. In the ovaries of fertile women, there are about 3-11 follicle cells involved in development each month. Usually, only 1 dominant follicle will eventually fully develop and expel an egg, while the rest of the follicles will gradually degenerate on their own. After the egg is expelled from the dominant follicle in the ovary, it is picked up by the umbilical end of the fallopian tube, where it then waits to meet the sperm and eventually form a fertilized egg. If the egg does not encounter sperm within 48 hours after expulsion, it will gradually decline and wither away, and will eventually be expelled from the body. If you are planning to conceive, you can go to the gynecology department of a regular hospital to test the development of the follicles and arrange reasonable intercourse when the follicles are about to ovulate, or for women with regular menstruation, arrange reasonable intercourse about 14 days before the next menstrual period, both of which can improve the chance of conception to a certain extent.