Progesterone Supplementation

I’m currently 5+5. My levels have gone from 37.6 to 33.1 to 22.7 and although I’m still within “normal” range I’m very concerned with the huge drop so we’re deciding to supplement with progesterone. I had an early loss a couple months ago so we’re just taking all precautions and trying to be proactive.

I’m speaking to a doctor about progesterone supplementation and I was originally prescribed Crinone 8% but my insurance does not cover fertility treatment or medication so it would cost me about $530 for a 15-day supply. She asked if I’d be comfortable using another supplementation and gave me a few options and I’m unsure what is best. I believe I’ve heard Prometrium is more cost effective?

If you are supplementing, what kind of progesterone are you taking/how much/often a day? TIA!