Mazal tov! I’m sure she would be more surprised if you did the party earlier as opposed to later, and she would probably be more up to it then (though it depends alot on how her pregnancy is going). That’s what I would do but you might have to play it by ear… Good luck with the preparations!
“like I said we dont know whats going on(all though we never really do)”
Sounds an awful lot like my family! 😉