I took a HPT on Dec 30th and it was positive, a week later I started to bleed. I went to the ER and they said my HGC levels were very low for being 5 weeks (173). I went back 2 days later and my HGC level dropped to (158). I've be lightly bleeding now for 25 days and my last blood test my HGC level were (1,556) how can this happen?