I don't know. I have a great ability to forget pain shortly after it happens.
I got kicked in the knee by a horse. Separated my knee cap. It hurt A LOT, but it was super sharp, super fast, and that screaming pain ended in a minute or two. Still hurt for a long time while it healed but compared to the initial kick, it was nothing.
I cut the ends of two of my fingers off. That part didn't hurt, too sharp a knife. Taking the bandaid the ER nurse put on my finger (dry bandaid, mind you) hurt really badly. You know, kind of felt like a flaying. Again, really sharp, really fast.
Broke my nose twice. Doesn't hurt as much as I expected it would.
I would imagine childbirth could put anything I've ever experienced to shame though.
I work on an orthopedic floor. Some of those traumatic injuries, OUCH.