Have my fingers crossed for you. If pups are due March 30, then your breeder would know by now if she's pregnant. Although anything can happen, I would say, yes, I think it's time to start getting at least a little excited!
I wouldn't be too worried about Dudley accepting a new puppy. Just be sure to introduce them very carefully and slowly. I would suggest that the puppy be left in the crate for a couple hours with Dudley out and free to sniff at the puppy through the crate. And always do everything for Dudly first: feeding, petting, etc. Once you know for sure you will be getting a puppy, post back; there have been a lot of great suggestions on this board about introducing a puppy.
Is your breeder by any chance from Thunder Bay?