Need some prayers!

I’ve had 3 previous pregnancies in the last 2 years... 2 ended in miscarriage and the other was a chemical.

I’m now pregnant again and have been getting blood work done every two days to determine if I need a progesterone supplement. (It was determined that low progesterone was the cause of my last miscarriage). My first blood draw came back with HCG around 150 (I can remember the exact number) and progesterone at 16. Next blood draw showed my progesterone had dropped to 12 and my HCG was only around 225. I demanded to be put on the progesterone supplements and the doctor agreed. Anybody ever been in a similar situation and wind up carrying full term? I don’t know if taking this progesterone will save the baby. I’m worried it’s too late.