Yes virtually everyone does. No one cares, no ones sitting there looking at your butt hole saying "haha shes pooping herself". They are professionals, youre not the first, its nature. They have a towel below if you poop they swipe your crack and carry on. Baby is too important to them to worry about your poop. You never know, you dont feel it, not even when they wipe. Trust me not breathing, cramping, and feeling a human come through your vajayjay like a stargate vortex is the only thing on your mind.