The pregnancy test is one deep and one shallow, the chance of not being pregnant may be 1%, because one deep and one shallow is also considered pregnant, the chance of pregnancy is 99%, the error will be 1%. The reason why there is one deep and one shallow is because the time of pregnancy is relatively short or the time of conception is relatively short and the time of intercourse is relatively short, which may cause one deep and one shallow. If you take the test 3-5 days apart, the pregnancy test will definitely have two equally dark colors. If you are particularly unconvinced, you can go to the hospital to have a blood test for HCG about 8 days after intercourse, which has a higher accuracy rate, the same as the urine test, and may have an accuracy rate of 99%, basically one dark and one light belongs to pregnancy.