Baby hit his head

I was sitting in the floor with my 4,almost 5, month old son and he jerked. I only cauvht ahold of his pjs and he hit his head on the hardwood floor. I immediately picked him up and was trying to soothe him. He only screamed for like 2-3 minutes. (I cried longer) . Should i take him to get checked? He seems fine and just wanted to look at the tv and cuddle. Hes currently asleep. (It is nap time) i dont know if I should take him in or jot . It turned red and there is a small bump where he hit. I feel like the worst mother ever :(