I think the decision is yours hun, you will be able to birth this baby and do it your own way. I hope you get a new MW and it is someone who is really supportive and she amy have other ways to tracking how you are going. FWIW I have popped a lot early this time and look bigger, but my fundal height has been completely normal So jsut because your belly looks bigger, the fundal height may not be

You are talking about GD. Polyhydramnios doesn't always have these symptoms and and can indicate problems with the baby, or indicate other risks such as early labour.
completely agree with krysalyss and nickle, I had polyhydramnios with DD and it was a really big fundal height all of a sudden that was the marker and a scan measuring fluid leves confirmed it, there was no other indicator the we could visibly see that would have have indicated it.