Why Is My Pregnancy Test Getting Lighter But No Bleeding? A lighter pregnancy test line could indicate fluctuating hCG levels, which are the hormone detected by pregnancy tests. This can happen for various reasons, such as testing at different times of the day, diluted urine, or the sensitivity of the test. In some cases, it may also suggest early pregnancy complications like a chemical pregnancy or miscarriage, but the absence of bleeding doesn’t always mean a problem.