Baby hits head

I was nursing my preemie baby when I saw a scary video that I wanted to show my husband since he gets frightened so easily. We are sitting side by side. He is on my left and baby is nursing on my left. When I showed him the video I didn’t expect the reaction I got. He jumped so bad that the phone hit the baby’s head. The baby cried for a minute but is not nursing again. Is there any chance I caused any brain damage or trauma? The baby seems fine and is acting fine. I know this may seem silly but I’m a first time momma so everything scares me. He weighs 4lbs 15oz and was born at 34 weeks.