I had a progesterone test done @ 5dpo, and tested low, so she prescribed the supplements to begin on that night (5dpo)
I also am on Clomid, and she says that it will raise my progesterone over time as well, but she'll continue to test each cycle after O just to make sure that I'm on track in case pregnancy does occur. This is all so crazy to me because last year when we tried, we were SO in the dark about all of this! We went in for IUI after IUI, obviously never knowing that there were so many ways to increase our chances!
I have to say that I think that my new doc is probably on the more aggressive side when it comes to fertility. But she REALLY seems to know her stuff! So I trust her!
I would advise you to take charge of your fertility though. I always say that you know your body better than anyone else could. So if you think that there's more that your doc could be doing and isn't, maybe consider looking for someone else. But if you trust him and are comfortable with his professional opinion, I respect that too. It's rare to find a doctor you truly like and feel comfortable with!!
Ayhow, here's hoping that we all get our babies really soon!!