Op, I dropped dd off the sofa yesterday. She's 7 months, I felt so guilty. She was fine and checked. I posted a thread on it too, the best advice I got was knowing I wasn't alone and to be kind to myself
Take her just in case otherwise you'll never put your mind to rest.
My brother accidentally stepped on DS1 when he was about 4 months old and I'd left him on the floor and he wasn't used to babies in the house. Luckily he realised and didn't put all his weight on him (he's rather well built!) but I took him in just in case. He was fine and the doctors were lovely. Said it happens all the time not sure I believe them though