The only case I know of, the whole point was just to allow her to give childbirth. They had to give her powerful immunosuppressants, and as soon as she'd delivered they removed the transplanted organs so that they could allow her immune system to return to normal.
A TG would not have the proper hip bone structue to give vaginal birth, so at best they could carry a baby and deliver (probably early) by C-section. Except that there are a bunch of reasons why this is a questionable idea (and it's not so clear it was wise even for the GG), so I wouldn't expect to see it happen anytime soon.