As your doctors may have told you, there have not been any studies done showing that prometrium (progesterone supplements) PREVENT a
miscarriage. But, it did make me feel more secure for those 3 weeks. I did have low-normal
progesterone levels during the first 9w6d of pregnancy, and I obviously didn't miscarry. My doctors just wanted to use it to make sure that they stayed within the norm during that period when the placenta begins to take over. But, your levels sound very normal...