baby fell off bed and hit his head

my baby just fell off of my bed face first and hit his head on the hardwood floor. he’s 6 months old. he woke up to eat so i put him in my bed to go quickly make a bottle. and i wasn’t thinking and didn’t put anything up to block him. i know he rolls so i’m not sure why i didn’t. he had a red mark but there’s no dent and no swelling whatsoever. he cried a lot and i held him for a minute and he settled so i gave him his bottle and he went back to sleep. i’m just nervous because he went back to sleep but hes still startling if u move around and stuff. i don’t want to put him back in his bed because i’m afraid to leave him alone. i feel so guilty. i’m not sure what to do. i’m half tempted to take him to the ER and the other half of me tells me he’s fine. i just want to cry. his older sister fell out of bed at the same age but she fell into carpet. he hasn’t vomited or anything like that and his pupils are reactive. i’m just so worried because after his bottle he went back to sleep so i can’t watch him for signs. 😭💔