bopped on the head

Chelsea • November 10, 2016 - Elijah Joseph W 💕
My son got knocked on the head. I was going to put him in his car seat and my grandma brought him down to me just as my knee hit the edge of the car seat and it bobbed him in the back of his head. 
He was falling asleep before it knocked him, but now he is falling back asleep. The doctors say as long as his pupils aren't too big he is probably fine. I worry. Has anyone done this before? 8 weeks old.