mine was all pressure, started out like really bad bloating feeling, like a balloon was blowing up inside me and was getting so big i felt i was going to burst!!!! then the balloon would get let down.
then all it was was involuntary pushes (before i was dilated) no pain with them. the only 'pain' was trying to stop the pushing - which was like trying to hold in a poo (a really big mother of a poo)