A pregnancy test is a test that uses the principle of HCG in the urine of women with early pregnancy to observe whether they are pregnant or have pregnancy-related diseases. If the amount of HCG in urine is high, the pregnancy test will show a strong positive result if the color is dark, and a weak positive result if the color is light. Normal HCG content in urine is the same as that in blood HCG, and can be detected from about 30 days after early pregnancy. The level gradually increases with the increase of pregnancy and reaches a peak at 8-10 weeks of pregnancy, and then gradually decreases. There are several possible cases of weak positivity: 1. normal pregnancy, but the pregnancy is short, such as 8-10 days after ovulation, or even within a shorter period of time. 2. strong positive followed by weak positive, there is a possibility of miscarriage. 3. ectopic pregnancy, the urine hcg level will be lower than the level of normal pregnancy in the same period of time. 4. miscarriage in early pregnancy, there will also be a continuous weak positive. 5. abortion or gravida after clearance, etc., the amount of HCG in the urine has not returned to normal. The amount of HCG has not yet returned to normal and will also appear weakly positive.