I didn't have any pain meds with my daughter. I never screamed during contractions. I may have moaned, more of a hum than a moan, and it wasn't loud. However, when i transitioned and they got me on the bed and she was sunny side up and I started pushing (i wasn't on my back either) I did scream a few times. From what I remember, muffled it by putting my face into the pillow, so it wasn't terrible, but I did scream. I wont lie, it hurt, and I wasn't intentionally screaming, it just kinda came out all on its own and I couldn't help it.
poor DH had no idea what was going on as they said they were going to check me and he thought woman had to lay on their back to have a baby (he was so clueless, poor guy), and it only took a few pushes and our daughter was born. i just remember the look on his face when they lifted her up. He was so focused on me and helping me (and he claims I squeezed his hand so hard he swore I was going to break it) he had no idea his daughter was being born.