Now, of course, Thomas Beatie is probably the most popular man to give birth, but he actually was not the first. Patrick and Matt, both trans men, had a child back in 1999 (although they weren’t legally recognized as men, or something). And, of course, trans people who had children prior to transitioning & non-transitioners never quite seem to make the cut of “non-women who’ve given birth/non-wermen who’ve fathered children”. I guess we aren’t quite ready to see pre-transition trans people as who they are yet (although, not all of them were, but it really doesn’t change the fact that they are a gender other than their assigned sex and that they had children.)
Depending on your views of Pope Joan, who may or may not have existed, may or may not have been a woman, etc- it’s pretty damn likely that pregnant people who aren’t women have existed for as long as humans have existed.
More recently, two men decided to ignore every cLGB ally who says “Gay couples can’t get knocked up by accident!” and went and got themselves knocked up. Discovery Health also did a documentary “Transgendered and Pregnant” that, from what I can tell, is about a trans man & trans woman, where the man was pregnant.
And for even more examples, there’s even a group for trans parents & parents to be on Livejournal!