Measuring 2 weeks ahead!

Today I had a growth scan because my son was born on the small side and I have a bicornuate uterus. My son was 5lbs 14oz at birth (39 weeks). This baby is already measuring at 5lbs 4oz, 2 weeks ahead! My fundal height also confirms 2 weeks ahead! I'm on track to have a 8-9 lb baby! I'm thrilled with this! Has anyone else had a smaller baby and then one on the larger side?