My biggest craving

I eat McDonald's so much. When I was in my first trimester one of the only things I could keep down was McDonald's which I thought was weird. It's my biggest craving and I get irritated because I don't want to gain too much weight but honestly I can't help it. I'm not over weight for my pregnancy or anything. And I feel bad that I want it so much. I don't eat it for every meal of the day but I get it pretty frequently. I guess I'll see how my doctor feels about any weight gain I have when I see him in in January.