A pregnancy test is a convenient way for women who want to have a baby to test themselves to see if they are pregnant, and it is generally relatively accurate to use morning urine. The principle is to measure the level of HCG in the urine, the higher the level of HCG, the more obvious the results can be measured, the pregnancy test stick will show a strong positive, that is, the second bar is clear. If the second bar seems to be weakly positive, there may be the following situations.1, the test time is too early, the time did not reach the 35 days or more time of pregnancy.2, pregnancy time delay, although the menopause has been more than 35 days or more, but a variety of reasons caused by the delay in ovulation.3, ectopic pregnancy, the HCG level will be low.4, biochemical pregnancy, although the formation of the fertilized egg, but the embryo did not develop after landing, died very early.5, the HCG level is very low, the HCG level is very high, the HCG level is very low. In a biochemical pregnancy, although a fertilized egg is formed, the embryo doesn’t develop well after it has been laid and dies very early.5. Embryonic arrest or miscarriage, in which the fertilized egg is laid and develops, but the embryo stops developing and the level of HCG is lowered.