Test getting fainter.... Help!!!

So I been taking test like crazy. I started day I missed my period... 9/28... last one at bottom in 10/6 fmu. Top to bottom ate in order. Suppose to be 5 weeks 2 days. What's happening. I'm not bleeding at all. I have been cramping a lot at night like middle of night. Any ideas? I know the brands can make a difference but still weirs. Bottom test looks negative but there is a very faint line... Any ideas?