serious question!!!

I have a serious question for everybody, is there anyway that I can have a very very very faint line show up for up to a week or more and I've had a couple come back completely negative but I've taken different brands and even those two had very faint lines. but then I take Juan's two days in a row that are completely negative, and I went to the ER with stomach cramps and they gave me a pregnancy test but they didn't do a blood test and they said my test was negative. could I possibly still be

pregnant just very early along because my boyfriend and I are really confused and it's too emotional! I've had now 7 very very faint lines and about three negatives and it's been about a week!!!!!