The most common reason is that you took the test too early. Faint line means the kit detected low levels of hCG. At the start of pregnancy, you will really only have low levels of this hormone. But as the pregnancy progresses, the levels will increase, paving the way for a more solid, visible line.
Other Factors to Keep in Mind
A faint line on a pregnancy test can be difficult to interpret. While it may indicate that you are pregnant, other factors may also come into play. Below are the other possible reasons for having a faint line pregnancy test:
1. Evaporation Line
Do you see a faint line? Then it’s important to note when you see it. If you see it past the time the instructions require you to see the result, then it’s probably an evaporation line.
The evaporation line is one that shows up in the results window after the urine has evaporated. You typically see it minutes after you’re supposed to know whether you have a positive or negative result. And, in most cases, an evaporation line is a colorless streak – not exactly a faint line.