I should have mentioned that I am 32 (my b-day is in Oct.). I don't know if any of my other hormones are out of whack besides the progesterone. I had to to a round of femara and a shot of HCG to make me ovulate, because apparently even though the femara worked, I wasn't gonna ovulate on my own. So, i'm not sure which hormone that would be connected with. Estrogen? I have read that progesterone and Estrogen kind of go hand in hand and if they are both low, then you would get symptoms kind of like what I have had. I would have to have bloodwork done to know for sure.
I have been wanting to call the RE but don't really know if it's appropriate. Because once you get pregnant and are good to go, they kind of "dis-charge" you and send you off to your OB. He never said I was pre-menopausal, but on the other hand, we never did discuss WHY my progesterone was low or what to do about it in the long run. So, now I am really curious and I think you are right, they would probably be the better office to call since my OB is so dang busy.
You don't say how old you are (not that it really matters) but there is the chance that you are pre-menopausal. Is that what your endocrinologist said? If that's the case, then there is the chance you won't be able to have another baby.
As for your period. It may only be days away. Most mums that don't breastfed get their cycles back around 6 weeks post birth and if you add 2 weeks (that you breastfed) to that you get 8 weeks. So it may just be a time thing.
Is it just the progesterone that's low or is it the other hormones as well? If your levels of FSH and LH are low too, that would probably stop you from ovulating in the first place. Progesterone makes the lining of the uterus thick to support a baby. Just low progesterone would normally lead to infertility but light periods.
You might want to give your reproductive endocrinologist a call as they'll know your circumstances better.