WTH! Positive tests but negative Qualitative blood test

Rose

I did 4 FRER , and one Clear blue rapid test and the Digital. The Digital said “PREGNANT” , the others were faint lines. I had a D&C on 7/26 but labs showed my HCG at <10 levels on 8/12. I went in to the hospital today and my Qualtative blood test came back negative. I am BUMMED!