DD2 is 9 months old. She loves being on the floor and is shuffling along on her bum and practicing on all fours. She is really mobile and just wants to go.
The problem is I am really nervous about everything (always have been) but when dd1 was at this stage we lived in a house with really thick carpet so I didn't worry so much about her bumping her head or falling on her face.
She can't really hurt herself too badly if she occasionally falls back and bumps her head, can she? She can sit for ages but every now and then her balance goes and she falls. I find myself having to sit with her all the time and the house is in a state.
2 words - cushions & rugs - they are a Godsend! Easily moveable from room to room. This stage won't last for long - you will then be onto following her round while she starts pulling herself up! (per me and my ds this week)
If she bumps her head on a flat surface from that distance, I don't think it's going to do any harm, though it might hurt and certainly startle her. The thing you need to watch for is sharp hard corners - things that would hit her all on one small area, which would be more likely to do harm. But babies have been learning to crawl for a long time - they're not that fragile.
She'll be fine. Deep breath and let go. My precious newborn would have had a crash helmet I was so neurotic. Dd2 is a complete stunt baby and at 11 month has survived all sorts of falls - on laminate floor.