Newbie Help: Hitting Head on Wall in Backstroke (ouch!)

Hi everyone, Just started swimming lessons a week ago and for the last lesson began doing the backstroke. I was swimming half pool lengths in the 4-ft. area to and from the wall and several times when going back to the wall I would hit my head on it. Wondering if you guys have any techniques to avoid that? Do you guys look back at all? If so, does the turning of your neck/head break form bad enough that it messes up that particular stroke cycle? Any help would be greatly appreciated. Thanks so much!!