Scared to have big Baby...

I went in for my 20week check up on Friday and the baby is already measuring 6days ahead and wring in at 14oz. I am only 5ft tall so the idea of a big baby is terrifying. I know every baby has different growth spurts but my lil man has been ahead from the beginning. I asked the doctor if it's normal and she said better bigger than too small. I know he's healthy and that's all that matters but it concerns me to have a baby too big. Anyone else feeling this way? I still have ways to go not due till June 16th.