Baby's Size

So at 30 weeks 6 days my doctor wanted me to have an ultrasound due to previous complication earlier in my pregnancy. They discovered my little boy's body measuring 2 weeks ahead of schedule, his head was 4 week, and he already weighed 4.2 lbs. I'm really nervous for his size. i have a feeling
i'm gonna have an 11 pound baby which is fine just nerve wrecking. They have tested my glucose 4 times and i don't have just gestational diabetes. 
Has anyone had this kinda of result? If you have did you end up having a larger baby? I have another ultrasound wednesday to see where he is at. I'll be 34 weeks and 3 days. so i will keep you all posted!