Egg cells usually survive for 12-48 hours after discharge, which varies from person to person. Mature eggs are usually discharged from the ovaries during a woman’s ovulation period, i.e., the follicle grows and matures around day 14-16 of menstruation and is subsequently discharged from the ovary. After the follicle is discharged, it is picked up by the umbilicus of the fallopian tube and then enters the juxtaposition of the fallopian tube, where if it meets with a sperm it will complete fertilization and form a fertilized egg. On the contrary, if the egg does not meet the sperm, it will degenerate in the uterus and eventually lose its ability to be fertilized and will be gradually expelled from the body. The follicle survives for about 12-48 hours after ovulation, usually no more than 48 hours, and the most fertile time is usually within 24 hours after ovulation. Therefore, if a woman needs to prepare for pregnancy, it is recommended to arrange intercourse as soon as possible within 24 hours after the follicle is discharged to increase the chances of conception.