I'm in agreement with Anna. I had something similar happen while walking down the aisle of my barn. Attended the birth of 3 little ones, one right after the other, then took a short walk down the aisle and found I had "missed" one that didn't get out of the sack. And this little momma wasn't due for a couple of weeks, and I never even guessed that baby would come that night.
The ladies are tricky!! I didn't have anyone to share my watch with, so I used to just sleep in the barn during delivery season -- and with the maidens, I slept in their stalls overnight.
We're praying for a perfect delivery for you!!