What to do if baby fell off couch
It's always wise to call your pediatrician if your child has a fall. Even if you don't see any issues there could be problems that you do not see.
I'm pretty sure we've all had a moment where we looked away and had to grab a newly mobile baby. Don't beat yourself up about it. I know my boy when from non-moving smiley newborn one day to mobile rolling over baby, seemingly overnight. It does happen! Just be careful moving forward. If you're leaving the room always put baby in a safe place like a jumper or bouncer, playpen or swing and make sure they are latched in.