Several parameters must be followed when testing to reach the most accurate result possible. But sometimes, when we don't follow these rules, it can mess up the result in various ways. After testing, when you look for the result and notice only a faint test line, it could be due to various reasons: - If you faced a chemical pregnancy, you could have mistaken it for regular periods. - You didn't get a high sensitivity test, which can affect the result from adequately showing. - Testing too early in the cycle can also affect the result and produce a faint line. - When you take the test at any time during the day, your pee is diluted, which doesn't detect the hCG hormone.