Julie, I have the exact same situation. I was 37 weeks this past friday based on my LMP. But, 37 weeks tomorrow based on ovulation, which the midwife is going by, since she wants to make absolutely sure that the baby is safe (she doesnt want a premature baby born in the water just because we didnt go by my O date)
But, Im all free to move and have a waterbirth as of 12 midnight tonight!!! Yay! But, Im crossing my legs for a couple of more days until the baby is a scorpio, or at least that is my dh's plan.
Anyway, hope that baby stays put until halloween. It really is only 12 more days!!