If a single bar appears when using early pregnancy test paper to check for pregnancy, consider that the pregnancy is short and caused by a low HCG value in the urine, in addition, it may be caused by dilution of the urine, and also consider that there is no pregnancy. The use of early pregnancy test paper to check pregnancy, it is recommended to use a week after the delay of menstruation, while using morning urine. In addition, the quality of the early pregnancy test paper will also affect the results of the test, as well as the use of the method, it is recommended to use the early pregnancy test paper produced by the regular manufacturers, it is best to follow the instructions to use, so as to improve the accuracy. If you are pregnant for a short period of time, you can go to the hospital to draw blood to check the HCG in the blood, which can determine the pregnancy. It is best to review regularly, pregnancy sacs can enter the uterine cavity at 40 days of pregnancy, regular ultrasound to rule out ectopic pregnancy. Multiple negative pregnancy test results can rule out pregnancy, or you can take a blood test, if it is negative, you can completely rule out pregnancy.