baby measuring big...

Just transferred to a new hospital due to my husband being stationed in new city. The doctor ordered an ultrasound to compare to previous ones not done at their hospital. The lady doing the ultrasound said that the baby is measuring at 33w3days but I'm 31w3days so that's two weeks more. She said the Doctor will have to confirm but I'm just curious if anyone else has experienced this and what it means? Should I be worried?