Congratulations on the new pregnancy! How exciting. I could not stand the sight of meat in my first trimester with each of my children, so you're doing well to fix what you do!
I have found the easiest way to meal plan is to take a blank calendar page and write the same meal on it somewhere 4x, tHen 4 of another, etc, until your calendar has most blanks filled. Part of my plan is leftovers, and part is eating out (because it's not realistic for us not to). Sometimes it's Breakfast for Dinner (scrambled eggs and bacon, toast) sometimes Meatless (like bean burritoes), soup/salad/bread, Italian, Sandwich Night (like Reubens) with storebought potato salad. Then you can simply make a master list of ingredients you'll need for a week or two , or however often you shop. I always try to plan for leftovers to either have for lunch or to freeze and pull out on Hodgepodge Night (everybody eats whatever they can find--there are only 3 of here now).
If you like that master plan, just photocopy it for the next month.