Sperm can survive in the female reproductive tract for about 2-3 days, and after being discharged into the female reproductive tract, it takes about 7 hours to reach the abdomen of the fallopian tube to unite with the egg. The time it takes for the sperm to reach the abdomen of the fallopian tube after ejaculation varies with each person’s physical condition and sperm quality. If you have intercourse before ovulation, you need to wait until after ovulation, when the egg is caught by the fallopian tube umbrella back to the tubal jugular abdomen and then united with the egg, you can wait for about 48 hours at most, if more than two days, the sperm activity gradually weakens and fertilization ability decreases then it is not easy to fertilize. In some cases, sperm activity is poor and it takes about 5-6 hours after ejaculation to reach the abdomen of the fallopian tube, which takes longer to unite with the egg.