I just got a faint negative and my period only lasted for one day does that mean the test is wrong and i am pregnant?

Possible Pregnancy: Repeat the test in 48 hours and use a first morning sample.

Probably not: Pregnancy tests can show faint lines at times making it difficult to determine the result. If you had a period, even a short one, you are less likely to be pregnant. Check another test, maybe using a different brand. Make sure the test kit hasn't expired. See your doctor if still not sure.