Measuring a month ahead??

My doctor informed me I was measuring 4 weeks ahead! She mentioned something about excess amniotic fluid and that the baby might not be swallowing like he should or could be due to a larger baby. She wants me to see a specialist in a few days to see what's going on. Just curious if anyone else has delt with something similar and what the outcome was. 
I'm 29 weeks. Measuring around 33weeks 😳