After pregnancy, the second line of the pregnancy test is particularly shallow. This situation mainly suggests two possibilities: first, the patient is just pregnant and the urine pregnancy test is weakly positive, mainly because the concentration of HCG in the urine is relatively low. Therefore, it is recommended that the patient be tested again with morning urine on the next day, and usually it will become a strong positive. Secondly, a persistent weak positive urine pregnancy test is caused by special abnormalities such as poor embryo development or ectopic pregnancy. Because of poor embryonic development or ectopic pregnancy, the activity of the gestational sac is usually not good and the concentration of HCG in the urine is usually not high. In addition, the increase is slow or even decreases, so the urine HCG test can be persistently weakly positive. Patients may also have vaginal bleeding and abdominal pain, and the diagnosis can be clarified by checking blood chorionic gonadotropin, progesterone and ultrasound.