With my first I always measured 2-3 weeks ahead I had a lot of extra fluid he was 7#14oz 21" does not mean big baby
Oh and btw his father was 8 lbs and i was 8 as well so it may have something to do with that but we can nvr really tell.
Not only was my son measuring 4 weeks ahead but my fundal height was also 4 weeks ahead consistently. No GD either. However my son was an 8 lb preemie. Couldnt imagine how much he wouldve weighed full term :O
My sister mesure big all the time with average 7 pound kids. Her issue is either extra water. Or mainly her uterus is just huge I guess. She's always mesure huge. I wouldn't panic unless dr feels like it's a issue