So they still have a uterus, fallopian tubes, ovaries, etc.
And once a month, nature dictates they flush their uteri to make way for a potential pregnancy when an egg is released from the ovary.
Science cannot stop this without removing said organs, so the woman who now thinks of herself as a man, even though she still has all the female organs listed above, still feels pain when nature flushes her uterus.
And what are we supposed to do for her/him/it/they?
Praying for them might be the best solution.
In some ways, I hold the non transgender folks who aid and abet this lunacy more at fault.