Low hcg nurse seems concerned

I am 5 weeks 2 days today. Last Monday, wed and Friday I had blood drawn. My numbers were 36, 59, 80. The nurse seems pretty concerned. Even stated "this dosent look good." I had a miscarriage in July at 11+4. I don't feel like I should be worried something keeps telling me everything is fine. But this morning the nurse said she will talk to the dr because she wants to find out what's going on. It's almost like she doesn't agree with the continuing blood tests and wants to see me. I know they are low and are not doubling at all. But does anyone have any advice? Any experience? Any insight? I feel like I should be nervous and worried I may loose my rainbow but I'm just not convinced. Thanks ladies!!