A single white bar on the pregnancy test indicates that you may not be pregnant, but false negatives cannot be ruled out with a pregnancy test, so it is recommended that you have a blood test for HCG (human chorionic gonadotropin) to review the test. Pregnancy tests are used to determine if you are pregnant by testing the level of HCG in your urine. In most cases, there is no pregnancy when a single bar appears. If the test taker’s period is regular and delayed, and a single bar appears on the pregnancy test, it is recommended that further blood tests be taken to check the blood HCG level to determine whether or not there is a pregnancy, and to rule out the possibility of a false-negative test. If the blood HCG value rises, even a single bar on the test paper suggests that you may be pregnant. If the HCG level does not rise, a single bar on the test strip indicates that you are not pregnant. If the blood HCG value rises, further gynecological ultrasound examination is needed to clarify the location of the pregnancy and whether it is ectopic pregnancy. If you are pregnant, you should pay attention to a reasonable diet, maintain stable emotions, and have regular checkups.