You can check for pregnancy with a test paper when you are more than 30 days pregnant. If the egg and sperm can successfully combine to form a fertilized egg after ovulation, you are pregnant. It takes some time for the human chorionic gonadotropin to rise in the body after pregnancy, so it is usually not possible to find out whether you are pregnant or not by testing too early. Early pregnancy test is a convenient and quick way to detect pregnancy by measuring the value of HCG, or human chorionic gonadotropin. This hormone is secreted by the placenta and usually appears in the urine after a few days of pregnancy, but it is not easy to detect at first because of the small amount, and it becomes increasingly evident around 10-14 days, so the test can indicate pregnancy at this time. Although the early pregnancy test indicates that a woman can do a pregnancy self-test one day after missing her period, not all pregnant women emit HCG at the same rate and in the same amount, so a test taken too early may also give a false negative reaction. Usually, in the early stages of pregnancy, women will experience a series of early pregnancy reactions such as dizziness, nausea, drowsiness and breast swelling, which will disappear on their own after three months. If a woman experiences the above symptoms, she can use early pregnancy test paper and pregnancy test for preliminary pregnancy detection. At the same time, in order to avoid ectopic pregnancy and to ensure the healthy development of the fetus, women should go to the hospital for further tests to confirm the diagnosis.