if you feel discriminated against at the hospital, frigging complain! noone has the right to make you feel inferior because of your weight. as long as your baby is healthy, and things are going smoothly for you, then your weight shouldn't really be an issue.
i'm sorry you are worried about this, you should just be enjoying your pregnancies.
and hey, if anyone says anything, tell them the cheeseburgers have gotta go somewhere baby!! xoxo