Returning to the poor, much abused thread, there are a number of issues. The first is the complete batshit bollocks of a woman becoming deliberately pregnant while expecting anyone to believe that she's a man. "His uterus" is no more credible than "her penis," and I couldn't utter either phrase without a staggering amount of eye rolling.
So I don't believe this pregnant person is a man, and I would take a lot of persuading to accept that she believes it either. OK, there's always going to be a disconnect between body and aspiration if you're hoping to be seen as the opposite sex, but actually getting pregnant is surely the ultimate reverse?
I don't see that pregnant men will affect healthcare directly because regardless of how she identifies she'll be treated as a woman though the poor HCPs will be reminding themselves at ever contact to use the right pronouns and not cause offence by acknowledging that she's performing the ultimate female work.
There's all the rest, though, that sex based protections will simply vanish if men, legally speaking, can become pregnant.
Generally speaking, though, it's the transwomen who pose problems. Transmen were raised with female socialization and tend not to be demanding. It's the transwomen who want into female spaces, whereas it seems plenty of transmen feel safer in the ladies and are not agitating to get into men's facilities.
I have to I say of the two options, I prefer the in-your-face piffle of "Pregnant Man" to the coverage of the fell runner found guilty of attempted murder in which the Guardian completely failed to mention that Lauren Jeska was a man, who tried to cover up his cheating to win trophies in women's categories.