S.B.
My copy of What to Expect When You're Expecting had a diet plan and recipes. It had specific lists of how much of this, how much of that, etc.They have a website but I haven't spent much time on it. The South Beach Diet also has a pregnancy/nursing diet on their website but you pay for membership. It may be mentioned in the book too, but the web site has more information and tons of recipes, but you can find a lot of those online on other sites if you search for them.
If I remember correctly, it's the same basic South Beach diet but with more dairy allowed so you're getting enough calcium. Again, very specific lists of foods and recipes. The nice thing about South Beach is it's more focused on the kinds of food you eat and not limiting how much - you eat until you are full but only the "good" stuff like vegetables and lean protein. Good luck!