A pregnancy test is a test that utilizes the principle that HCG is contained in the urine of a woman who is pregnant at an early age to observe whether she is pregnant or has a pregnancy-related condition. The amount of HCG in the urine is high, and the dark color of the pregnancy test mark is strongly positive, while the light color is weakly positive. Normal urinary HCG levels are the same as blood HCG and can be detected from about 30 days of pregnancy. The level gradually increases with the increase of pregnancy and reaches the peak at 8-10 weeks of pregnancy, and then gradually decreases. Weak positivity can be found in the following situations:1. Normal pregnancy, but the duration of pregnancy is short, such as 8-10 days after ovulation, or even a shorter period of time.2. Strong positivity followed by weak positivity, with the possibility of miscarriage.3. Ectopic pregnancy, the urinary hcg level will be lower than that of the same period of time of a normal pregnancy.4. Miscarriage occurs in the early stages of pregnancy, and weak positivity will also continue to be found.5. Abortion or gravidarium, etc., the amount of urinary HCG is not yet back to normal. HCG amount has not returned to normal, will also appear weak positive.