Low HCG and Viable Pregnancy

Ashton
Has anyone had a HCG test of 8.5 and had a viable or continued pregnancy? 
I'm doing fertility so I know that conception occurred Dec 2-5. I'm guessing I'm 2-4 weeks. 
My nurse said I am in fact pregnant but that I'm at a very high risk for MC. It's taken a year to ovulate and I felt so good about this. I feel like the joy of actually being pregnant is being over shadowed by the gloom of MC. I thought once I got pregnant I would be so excited. I got good and bad news all in the same sentence. 
Hoping for a Christmas Miracle!