Pregnancy tests are not accurate for more than an hour and need to be retested. Pregnancy test is to determine whether you are pregnant or not by detecting the concentration of HCG (Human Chorionic Gonadotropin) in your urine. It is usually done when you are about one week overdue for your period, and it is recommended that you take a morning urine test to be more accurate. A pregnancy test can be inserted into the urine and the result can be viewed within 1 to 5 minutes, but the result will not be valid after more than 10 minutes, so the result will not be accurate if the pregnancy test is taken for more than an hour. When a red line appears in the white display area of the pregnancy test paper, it is negative, and when two red lines appear above and below it, it is positive, suggesting pregnancy. After the diagnosis has been made, an ultrasound examination should be performed at around 40 days after menopause to determine whether the pregnancy has occurred. Early pregnancy should also pay attention to appropriate rest, avoid exertion and strenuous exercise, take folic acid on time, increase diet and nutrition, and take obstetric examination on time.