A pregnancy test stick with one dark and one light line 6 days after menstruation is delayed may be pregnant, or there may be a false positive result or an error in the test method. The two lines of the pregnancy test stick, one is the control line and the other is the test line, when HCG (human chorionic gonadotropin) is detected in the urine, it will react and make the test line appear, generally the accuracy rate of the pregnancy test stick is about 85%-95%, and there is a certain probability of false positives. A pregnancy test stick is weakly positive, combined with menstruation delayed 6 days, if the pregnancy, the conception time is still relatively short, the urine HCG concentration is low, may be manifested as a weakly positive, if ectopic pregnancy, biochemical pregnancy, etc. may also be manifested as a deep shallow, so the diagnosis of pregnancy need to draw blood to clarify the value of blood HCG, gynecological ultrasound to determine the uterus pregnancy. Therefore, if your period is delayed for 6 days, and the pregnancy stick detects a deep and a light, there is a certain probability that you are pregnant, but you still need to go to the hospital to complete the blood HCG and gynecological ultrasound to further clarify the diagnosis.