If ovulation has occurred, the egg will be waiting for the sperm in the fallopian tube. After intercourse, the sperm will take an average of 1.5-6 hours to reach the fallopian tube, where it will unite with the waiting egg to form a fertilized egg. If ovulation has not occurred at the time of intercourse, the sperm will arrive in the fallopian tube and wait for the egg, which usually lasts for 2-3 days. The fertilized egg will enter the uterine cavity by the peristaltic movement of the fallopian tubes and find a suitable place to settle and grow in the uterine cavity.