OK.... so its a hormone that supports a pregnancy, but what else does it do? What other signs are there that you dont produce enough?

I read somewhere that it may include oily hair and facial hair starting to appear.....

Went to the doc today (finally) to get a referral for FS (if i ever get to go, for those who have read my other posts) and doc says he thinks i have a progesterone problem.

Now i know poor HJ had to go through all of this, and i have ben following her thread, but i want more info - what exactly is progesterone??!! Can it lead to depression if you dont have enough on a day to day basis (something else i read briefly).

googling like crazy and just hoping someone can please point me in the right direction of some info?