Help- Low Progesterone

My husband and I finally found out we are pregnant, and yesterday we were super excited to have our first doctors visit and found out we were 5 weeks along. However, my HCG level is at 1,152 and my progesterone was only at 3.1. I have been extremely stressed and now I am terrified that this will end in MC. He called in an oral progesterone supplement and I have started taking them, but from what I understand, it may be too late to make this a viable pregnancy.

Has anyone else experienced this?