At 28 weeks I measured 35cms and was refered for a growth scan and GTT (neg). Scan put baby on 75th centile, so not too big.
At 38 weeks I measured 53cms and again was refered for growth scan. Doc didn't do one, just had a good feeland said although it was big. nothing to worry about.
BTW, I was HUGE!
Beautiful son born 12 days ago after 18 hr labour and emergency ceaserean.
He weighed 11lbs, 2.5oz !!!!
Don't want to scare you! This I gather is extemely rare. He was the biggest baby the doctors had ever delivered and was famous throughout the maternity wing as the 5kg baby. Midwives and doctors would come into my room asking to have a look and a cuddle!
Good luck Hun!