[MommaBunny]

Well, my labor itself didn't go ALL that fast, and neither did the other women who I worked with--it was just the pushing phase that was exceptionally short. I was in easy/early labor for about ten hours, hard labor (6-10 cm) for about three hours, and pushed for 20 minutes. It was my first birth. I'd maybe take a half dose or so if you're worried your MW won't make it. (;