Hi Judith,
It's unfortunate we cannot discuss dosages, because that is very relevant here, and you don't state your age, which is also important, I feel.
I am 61. I have been on HRT for about three and-a-half years, and about six months ago I asked my endocrinologist to put me on progesterone because I have small boyish areolas and nipples, and since progesterone is known to be essential for the development of breast tissue in cis-gendered females, I wanted to try it. My endocrinologist finally relented and prescribed the lowest dose. I started out with daily administration, and then changed to doing a triple dose ten days out of the month. Unfortunately , I cannot tell you if it made any difference cycling it this way, because after about four months I had a follow-up visit with my endo, and he discontinued the prescription when I told him there was minimal change.
I was not happy about that, because I felt four months was hardly long enough to know if it was working. I do feel my nipples were larger, but there was no change in the size of my areolas. I also had breast augmentation during that time, so he felt progesterone was no longer necessary. Well breast size was not the point! He was not listening to me. Men!
Last month I had my final follow-up with my SRS surgeon, and she gave me a prescription for progesterone cream for topical administration, but it has only been a couple of weeks, so I can't tell you if it is working yet. I can tell you that low-dose oral progesterone had no effect on my body fat distribution. I intend to cycle the use of the cream, since it is an anti-estrogen, and it made sense to me to mimic a natural female hormonal cycle as far as breast development. There are no clinical studies done on transsexuals as far as the effect of progesterone on breast growth, so all evidence is anecdotal. I am glad to hear you are getting good results!
With kindness,
Terri