My 1 yr old measured 3 weeks early, he was estimated to be 10 pounds. He ended up coming 4 weeks early and as a preemie weight 6lbs 4oz at birth. He was healthy as could be and did not require anytime in the NICU. Don't be scared, your doctor should have you do regular ultrasounds (monthly) to monitor the weight.
I'm 29 weeks pregnant now and I'm measuring about 1 1/2 weeks ahead with this baby.
At 27 weeks baby was measured weighing 2 pounds 9 ounces i asked my doctor if that affects my due date she said no that due date won't change
Here I am measuring two weeks less than I am
Don't be scared you could just have some extra fluid also its very common to measure one two weeks a head
Dr told me I'm measuring further along so they scheduled am ultrasound