I've given up on bras with any shape, and I'm not sure anybody even makes a nursing bra that fits my size. I'm a 34H when not pregnant. At your size, you do have a lot of options still.
Elomi makes great bigger bras, and are my go-to when I'm not pregnant.
What I'm wearing now is two True & Co bras layered over each other in size XL. They are this wonderful, super comfortable soft almost bathing-suit like material that is so comfortable and stretchy. They don't do much for me at all shape-wise, but I'm past the point of caring at almost 38 weeks. They will look better on you than they do me, and one will probably be enough for you.
You can order them from Nordstrom with free shipping and returns, which I would recommend over the True & Co company website.
Another soft bra is Kindred Bravely, available from amazon.com