Thanks, Calibee, She prescribed it because I asked. There's been suggestions that progesterone helps support pregnancy, even if you progestrone levels aren't low and you LP is okay. I have read that it supports women who have previously miscarried and also helps the body "accept" a pregnancy, which may be an issue if you have anti-bodies. It is all speculative in my case, because I don't know for sure that a) I need it for a less than perfect progesterone level or b) that I have anti-bodies. I just want to take it in case I have either of those issues.
It is the synthetic form(medroxyprogesterone) and I have read it isn't to be used in pregnancy, but like you say, a small dose may be used to support the luteal phase. I don't know why she chose it over prometrium - actually, I think she chose it because that is what her pregnant patient, who had done ivf, was using.
I am tempted to take it at that low dose this month, and when I get a chance will see her or another doctor and discuss getting prometrium (which is hormone identical, rather than synthetic) or progest.
It seems to me that most women doing IVF or using progesterone are NOT using provera, and I wonder why she (the doctor) doesn't know that?