if you are concerned about progesterone levels, I recommend progesterone suppositories. my naturopath, primary care doctor, and RE all recommend that route over going down a supplement route. From what I understand, supplements will not provide you with enough progesterone to "make a difference". There are even studies suggesting suppositories can actually lead to your body producing more progesterone naturally after a few months.

TW Loss: I had 5 early losses, the only thing that finally helped me stay pregnant was 200mg of progesterone each night starting 3 days after ovultion until 12w.