At the start it was kinda like period pain, but not a dull ache thats there for a few minutes.
As is went on for me it was just like sharp period pain.
The actual way I would describe is like my cervix being pried open. Intense.
Very painful, but I made it through twice naturally.
Well with DS I begged for pethidine in transition, but didn't get it til 10 minutes before he was born, so it didn't kick in til after.