Like the previous poster said, I'd plan a big early birthday party.. then on her actual birthday have a smaller celebration && focus all your attention on her.. that's what we do every year for my son bc he was born on the 4th of July && everyone usually already has plans.. but bottom line, he gets 2 days to celebrate his birthday instead of 1 so he enjoys it (:
My daughter turns 3 the day after my due date. I'm just going to plan an early birthday party and whatever happens, happens. It sounds bad but you can't really stress about it too much.
I would say plan a big party early and if you're still pregnant on her birthday have a smaller celebration