Completely normal to measure bigger. I also measured 2 weeks ahead and had my son 2 days late.
With my first pregnancy I measured small the whole time, I had low amniotic fluid index, I went passed my due date by 5 days and she weighed 7pds7oz. This time around I measured 2 weeks bigger but my ob told me the baby could have just had a Growth spurt, im measuring right on track now, so it all just depends really :). Congrats!
I measured bigger with my first and she arrived at 37 weeks 7 lb 7 oz.....it's not a rule but it's possible.....so my advice is just be prepared, it doesn't hurt to have hospital bag ready