A single bar on the test paper usually means that there is no pregnancy, but we cannot rule out false-negative result errors caused by factors such as test paper failure and incorrect operation methods. Test strips are usually referred to as early pregnancy test strips, which can be tested through morning urine after the delay of menstruation, mainly through the detection of human chorionic gonadotropin levels in the urine, so as to confirm whether a woman is pregnant. If the test results show a single bar, most women are not pregnant. The results are not 100% correct and can be affected by humid conditions, expiration dates, incorrect handling, and short duration of pregnancy, which can cause errors in the results. A more accurate way is to go to the hospital and have a blood test for HCG with the doctor to determine whether you are pregnant or not. You can also take an ultrasound or abdominal ultrasound to determine if you are pregnant.