I also am on bi-identical progesterone. There is a lot of good protective things in progesterone only. Particularly if you are very estrogen dominant. Having too high estrogen in relation to progesterone can be bad. I would suggest a saliva test to determine where you are.
Started Primal June 2012 at 148.5lbs, and 5' 1", reached goal weight in 5 months.
Lowest weight 93lbs - too thin. Now stable at around 100lbs much better weight for me at my age.
Primal, minus eggs, dairy and a myriad of other allergens.