Chemical?

I was 6 days late took 3 tests with faint lines. Saw blood on the 7th night still a faint line then on the 8th day no faint line. Blood (not extremely heavy) just mild and mild cramping. Anyone have this happen before. I thought for sure it was chemical but I'm reading a lot and I guess I'm just hoping it's not. Any advice or personal experiences appreciated! Getting 2nd blood test done tomorrow (first one came back indeterminate, not pos or neg) but don't want to look like an idiot if nothing comes up for tomorrow's.