Why Did My Contractions Stop at 2cm Dilation?

So went to the hospital at 4 this morning after
My contractions (which were back and front) lasted for over an hour at 4-5 minutes apart but never dilated past a 2 and my contractions stopped.. Was sent home and now I'm waiting for them to stray up again???? Anyone else have this.. The contractions were INSANE back labor is no joke..