Normal to scream when you feel the peak of contractions during delivery?

Mummies, i remember screaming pain at some point when contractions are on the peak. My kids are delivered normal without epidural just normal delivery. 3rd born -Control as much as possible 4 hours contractions. intense pain came in at the last 1 hr , remembered screaming and manage to push baby out with 3 push. I still found it embrassing to scream but only mommies know the pain was 'killing angel in us'..Any tips mummies..