32 weeks & my baby weighs 4 lbs 12 oz

Hey ladies, has anyone been in a situation where their doctor told them their baby is weighing a little above average ? my doctor just freaked me out. My baby weighs 4 pounds and 12 ounces. Hes suppose to weigh just 4 pounds exactly. I have been gaining weight and eating not too great. Not sure why ive been craving so many carbs, sandwhiches, bread, pasta ugh :( anyway he told me to start walking on the treadmil after a meal. i really dont feel like workkng out while being pregnant but i guess i have to. has anyone ever been in this situation and their baby turns out to be fine & not huge at birth?!