A urine pregnancy test is a clinical test that detects HCG levels in the urine. An elevated level of HCG indicates pregnancy and will result in a positive urine pregnancy test. If a weakly positive result is found, it is clinically indicated that pregnancy is possible and it is necessary to test again in a few days, probably because the pregnancy is relatively short and the concentration of HCG in the urine is relatively low. If the test is still weakly positive, it is clinically necessary to exclude the possibility of ectopic pregnancy and it is recommended that blood be drawn for monitoring. In early pregnancy, it is advisable to use morning urine for the test, as the HCG level in the urine will be relatively high and the detection rate will be high.