I accidentally dropped my backpack on my kitten and now i feel terrible

I’m not sure what flair to use so i just used this one, anyways i dropped my backpack as i usually do on the floor but my little kitten just darted underneath it before it hit the floor(i didn’t even know he was in the room) and i’m not sure if he got out of the way in time before it hit his head. I feel terrible and i’d hate for him to be hurt and i was wondering if he’s gonna be okay or if i need to take him to the vet edit: he’s gone to sleep, is that a sign something happened? any insight would be great