29 week check up

Darrina • Married, Age 34 Baby number 1
I was at my midwife appointment for my check up. The midwife did the first measurements of the baby. She measured baby 32cm. I have been told that baby is bigger than normal at this stage of pregnancy. I have to go back in a few weeks to get more measurements and if baby is still measuring big then they are going to send me for a scan. Should I be worried or is this normal. This is my first pregnancy.