Pregnancy test bfp then faded away.

Lexi
So i took a test yesterday. Im a week late as of today. As i watched the dye run across it stuck on the positive line but wheb it was done it was mostly gina but very very veey faint...had a veey very very faint positive a few days prior but it was blue dye and id thi k it wpukd be darker by now. Any thoughts?