It takes at least three days after the fertilization of the egg to detect whether the pregnancy, the fertilization of the egg is about the seventh day after fertilization, after the fertilization of the egg, the cells of the trophoblast layer of the syncytium begin to secrete chorionic gonadotropin, three days after the chorionic gonadotropin in the blood has reached the level of detection, you can do the blood chorionic gonadotropin test in the hospital. If you can’t find out by using pregnancy test paper, you need to be patient. If your period is more than three days overdue, you can use pregnancy test paper and morning urine at the same time to do the test. You can also do ultrasound examination after ten days of menstruation, the pregnancy sac found in the uterine cavity can be determined to be normal pregnancy.