A line is a line, faint or not. What kind of test did you use? A faint line typically just means that you are really early on in the pregnancy so you don't have a high level of HCG in your system. Did you take the test with first mornign urine?
any time there is a line no matter how faint it is there is a detection of HGC which the the pregnacy hormone so you more then likely are pergnant but the best time to take another test is with your frist morning urine that is when it contains the most HGC leavls
Wait tell morning and take another one.