The respondents do not seem to read the question. Gender reassignment surgery generally refers to the removal of organs of the reproductive cycle, in whole or in part. After such an operation, no pregnancy is, of course, purely technically possible: at least the ovaries are removed and, therefore, there are no more eggs that can be fertilized. But not every transsexual (who, by the way, is wrong and unethical to call a woman) can and wants to perform such an operation (for a variety of reasons) - and many transsexuals limit themselves to taking male hormones and / or removing the mammary glands, and their female reproductive system remains (although taking hormones suppresses her work). And in this case, yes, pregnancy is often (not always, depending on the characteristics of the body) possible if you stop taking male hormones.
Maybe. I know a girl who subsequently underwent an FtM transition (HRT + mastectomy), after which, some time later, he had a pregnancy and childbirth. Hormone therapy is suspended, and after the birth of the child is restored. Perhaps there are more nuances, but I am not aware of them.
Yes, it can, it even happened - https://ru.wikipedia.org/wiki/%D0%91%D0%B8%D1%82%D0%B8,_%D0%A2%D0%BE% D0% BC% D0% B0% D1% 81
He gave birth to a baby by caesarean section, because wife is infertile, they used artificial insemination.