Was going to answer you on Babycentre but figured you'd have posted on here as well 🙂
I had 7 scans in total with Hannah, at 8, 12, 14, 20, 28, 32 & 36 weeks. At the final scan I was told she'd be "around 8lbs, good average sized baby". She was 9lbs 8oz at birth (at 39+4 gestation). Only after that was I told that there is a *massive* margin for error on the growth scans!
With Edward it's a bit different as he was triplets to start with then ID twins till we had TTTS at 23 weeks and lost our other twin at 26 weeks as a result. So I lost track of how many scans I had, certainly they were at 7, 9, 12, 14, 16, 19, 20, 23 x4, 25, 28, 30, 31 x3 plus a few others at the specialist treatment centre for TTTS. He was born at 31+3 gestation, I had scans scheduled every 2 weeks till the planned delivery date though. I have no idea how many of those scans were growth scans due to diabetes and how many were for other reasons!