2 weeks overdue mean massive baby?

Im 39 weeks pregnant, just wandered if I go to 42 weeks will the baby be huge? Im already massive and struggle to walk! Has anyone had a big baby? And done it vaginally? I have a feeling I will have to be induced as this is my first baby and it wont budge! My sister had 5 and 6lb babies 2 weeks overdue..she was lucky....what if none her newborn clothes done fit because of her size. I dont really want a 9lb baby it wont look tiny and newborn and will damage my vagina as I will have a nasty tear.