It takes about 1-1.5 hours for the sperm to reach the egg and about 4-6 hours at the latest, but successful fertilization depends on the quality of the sperm as well as the egg. It takes about 1-1.5 hours for the sperm to reach the vagina and then the egg, and about 4-6 hours at the latest. The terminus is mainly the juxtaposition of the fallopian tubes, where the sperm and the egg meet and combine with each other and form a fertilized egg, but when the quality of the sperm or the egg is relatively poor, it may not be able to form a fertilized egg. It takes about 15 to 18 hours for the egg to be released from the ovary, and this is when the egg is most capable of being fertilized, maintaining its ability to be fertilized for about 30 hours. After the sperm and egg combine with each other, they can reach the uterine cavity in about 3~4 days, but it depends on the individual situation and the quality of sperm and egg. If you have had intercourse before, it is recommended to test with test strips about one week apart; you can also analyze it through ultrasound, and you should consult your doctor if you have any doubts.