I have big(ish) babies! They're not so scary I promise!
My first was 9lb 8oz, I was only a teenager. Did it all on gas and air, no problem, no tears, easy.
Second was 8lb 13oz, again, no problems.
Third was 9lb 4oz. I can't remember about the growth scans for the other two, but the last one I remember at 36 weeks, I was told baby was 8lb already. I went 8 days over and she was 9lb 4oz.
It's really hard not to read into the growth scans, but they are notoriously inaccurate and can be way off.
Even if you have a big baby, it doesn't mean things will go wrong. All of mine were fine, and I've heard bigger babies are 'easier' births because gravity helps. Trust your body, it will only hold a baby it can birth, and you have great care looking after you.
(And remember to try and keep active and not lay on your back for the birth, really helps!)