Is the pregnancy test paper one dark and one light? (Interpretation method of light and dark lines) Early pregnancy test paper is a common method to determine early pregnancy. It determines whether it is by detecting the concentration of human chorionic gonadotropin (HCG) in the urine. Pregnant. However, sometimes we encounter situations where the pregnancy test paper is one dark and one shallow. Does such a result mean pregnancy or not pregnancy? The following is a detailed explanation for everyone from several aspects. Reasons for Color Shades First, we need to know the reasons for color shades. Pregnancy test strips generally have two red lines, one is the control line of the test strip, and the other is the detection line. If the color of the detection line and