That is the lowest dose of transdermal estrogen patch you can be on. I was on that for years and it did maintain my gains from Forteo. I recently saw an integrative gynecologist and she upped my prescription to .0375. I think she would have liked to raise it to .05 but I was concerned about the possibility of breast tenderness. The .025 dose seems to have worked but I think the small boost is probably a good idea since I'm not on any osteoporosis drugs for the past 5 years. The dose of 100 mg oral progesterone is the standard prescription for uterine protection.

As far as starting HRT well past the time of menopause, it is considered more risky particularly in terms of cardiac/blood clot risk. Risks of cardiac events are most prevalent in the first year and then the risk diminishes according to the research cited in Estrogen Matters by Avrum Bluming. It would be a good idea to know your personal risks before taking HRT. When going off HRT, bone density declines but I don't know if that would happen if you are taking it for such a short duration.