My OB has done a tonne of bloodwork at different times of my cycle, and I am honestly not sure what my progesterone
levels are. My 2nd pregnancy he had me start
prometrium at my first appointment with him (about 5 weeks along). After that loss, he gave me a prescription for prometrium so that I start it as soon as I get a positive on my home test. He said it can't hurt anything to be on it. I also found out here that many many of us "older" expectant moms are on it.