I agree, there's not too much to worry about as long as baby isn't measuring. I've been measuring ahead through the whole of this pregnancy, last check up I was 36 weeks measuring at 41... Theyre only rough estimates though. The only problem that could POSSIBLY come from measuring ahead is that you could struggle to carry towards the end of your pregnancy and may end up having to have assisted delivery, but 1-2 weeks shouldnt make much of a difference :) Other than that you and baby should both be absolutely fine!
Don't worry. My little bit was weighing a pound and 3 oz when I was 21 weeks lol. Baby may be a little chubbster but it's all good.
Yeah its normal. Those measurements they give you really cant be spot on with every baby because every baby is different. Id only be concerned if baby was measuring way behind. Ive had 2 healthy pregnancies already and both my kids measured ahead. My daughter was always 1 week ahead and my son was 1 month ahead! :) he was a big boy though an 8 lb preemie. Good luck! :)