To check for pregnancy with a pregnancy test, use the first urine you get up in the morning for the most accurate test at this time. Also, it needs to be tested when the period is 1-2 days late, which is also more accurate. It is not very accurate for women to use pregnancy test paper to detect pregnancy, because due to the quality of pregnancy test paper and other hormonal interference, sometimes false positive or false negative performance can occur. The more accurate way to detect pregnancy is to check the blood. If the HCG in the blood is elevated, it indicates pregnancy, and the blood test can detect it 2-3 days before menstruation.