If a lighter red mark appears when you use a pregnancy test to detect whether you are pregnant or not, it means that you are not pregnant. When testing through a pregnancy test, there are three kinds of test results that are meaningful: First, one line appears, which means negative and no pregnancy. Second, the appearance of two lines, perhaps two lines of exactly the same color, that is, two darker, is called a strong positive, indicating pregnancy. Third, the color of one line is darker and the color of the other line is relatively lighter, one darker and one lighter, which is also called a weak positive, indicating pregnancy. If one line is negative through the pregnancy test, it means that there is no pregnancy. When taking a pregnancy test, it is necessary to take the test more than two weeks after intercourse, as long as this condition is met, the accuracy of the test is relatively high.