Rena, don't think twice about it, call ahead and get a special plate. It's important to always think of your new lifestyle as a "cure" for your prior addictions.
If you were an alcoholic would you take a drink at a social party so you wouldn't insult your hosts? Of course not....it's the same with your foods. When you are invited to a party don't ask if you can bring something, just do it. It's simple enough to put together a nice antipasto with greens, meats and fancy cheeses. It will be admired and enjoyed by the hosts and guests without standing up and replacing the main entree. This way you've resolved two of the big social questions;
1- Should I bring something with me?
2- How do I make sure I have food to eat at dinner parties?
Now I know your hubby already asked if you should bring something and he may have been told no. Ignore that...believe me the "no" you received was a polite no. Everyone loves it when people arrive with gifts
After you put together your fancy antipasto plate take a pic and post it, I look forward to your artwork