It takes no more than 24 hours for the sperm and egg to unite to form a fertilized egg, which varies from person to person. The sperm passes through the cervix and uterine cavity before reaching the fallopian tube, where union with the egg occurs. First, the radial crowns around the egg are separated by the action of seminal enzymes released by the sperm. The sperm’s apical enzyme digests the zona pellucida around the egg, allowing the sperm to pass through the zona pellucida and into the egg cell to form a fertilized egg, and the sperm goes in to combine the male prokaryotic nucleus with the female prokaryotic nucleus, a process that takes about 24 hours. If you want to determine whether you are pregnant or not, you can wait until after menopause to take a urine pregnancy test, or go to the hospital to do blood HCG test to clarify.