Low hcg at 6 weeks impending miscarriage ?

I think my pregnancy is going to result in a miscarriage. I got my betas drawn again today at what should be 6 weeks 2 days. It was only 1,166.

11/9 hcg 3

11/12 hcg 21

11/15 hcg 33

11/19 hcg 121

12/1 hcg 1,166

From the 19th-1st my numbers only increased by 45% and a doubling time of 88 hours or 3.7 days. My doctor is staying positive but I have a gut sinking feeling this will end in yet another loss. This is my 7th pregnancy and I have 2 living children. Doctor is having me repeat blood work in 2 days. Has anyone had similar numbers and it turn out ok?