I can't compare big vs small, sorry!

I had 36 week u/s that showed DS weighing 9lb @ 36 weeks, and put my due date 3 weeks earlier than what it was.

I was induced at 10 days post dates. DS *was* 10lb 4oz, and did have a larger HC of 38cm, but I birthed him with only gas/air, and had no tearing from his head (I did have a small tear but that was cos his shoulders and the rest of him flew out really fast!)

Most babies are the prefect size for their mummys bodies, so hopefully this will be the case for you.