Maybe miscarriage or ectopic

I went in on Wednesday for cramping got my blood test and it came back with 626 hcg level. Now today I have 906 hcg. I'm not sure what's going on, I'm trying not get upset, but the doctor said there's a change this isn't a good pregnancy. I'm only 5w2d and I was wondering if anyone exprenced this and had a heathy baby.