Thanks everyone for sharing your dates! It's interesting to see all the numbers.
As for what I'm going to do...I've spoken with my manager and arranged to use the week of vacation time at 39w. If baby doesn't come during that time off work (which would be anywhere from 37w 5d through 40w 0d) then I'll return to work on 40w 1d and work until he arrives. Not a big deal. Once baby is born I have 12 weeks off, then I'm working 3 weeks of half days, then it'll be November with a week off that month, then two weeks off in December. If I don't use this time before baby...not sure where to use it after baby as I'm already going to be out for most of the end of the year.
I don't have much left to do at home besides clean (clean and clean!) but day by day sitting at work becomes increasingly more uncomfortable, bordering on downright painful. And I'm only in the office 2.5 days a week, I can't imagine if I had to be here 5 days a week...I'd be even more of a whiny baby.