no i think it's fine here they allow u 3 cm's eitheer side of ur weeks before sending u for a scan, so i think all it means is your right where u should be as next time u measured u might not grow so fast and might be bang on.
Is it by fundal height, or ultrasound. It's only a two week difference, and is pretty common in most women. When I was 33 weeks I measured to be 27 weeks and my baby was perfectly sized in height and weight.