Oatmeal or special K for breakfast, an egg doesn't take long to cook either, make some hard boiled to have on hand for egg salad sandwich if you like those of course. Snack on Apples and celery with cheese or peanut butter, baby carrots, Almonds, yogurt, smoothies, you can make them ahead when you have energy and freeze. You should eat little stuff like that every couple of hours.
Soup, there's lot of healthy ones out there. Baked potatoe (light on the toppings). Quesadilla's with chicken or refri black beans, lite cheese (I put these in the fry pan with tiny bit of olive oil just to get crisp) but you can put them in the micro. Turkey sandwich or better yet turkey wraps with spinach, feta cheese and little bit of rasberry dressing. Grilled cheese on wheat. Portion control is a really big part of it, I eat most anything I want but the bad stuff, just a little bit! Bite size snickers vs a whole one etc.
Those are on the top of my head, I am sick and not totally there but I will jot more down when they pop in my head and send to you. Granted some stuff might not agree with you being preggo's I know my sis couldn't eat beans at all. Stay positive. :)
Dog