I would suggest making a few big meals on the weekend and putting them in the fridge or freezer for the week. Lasagna and meatloaf are good options, or roast a turkey or beef roast (much healthier than processed sliced meats). Also, cut up some veggies (carrots, celery, broccoli, cauliflower, peppers) and fruit (melons, strawberries, etc.) for snacking. Put these in clear containers in the fridge so they will look appealing. Boil a few eggs and leave them in the fridge with shells on. I mark mine with a pencil so I know they're cooked. Use within 3-4 days.
At mealtime, if you're not that hungry, you can nibble on a few of your veggies and add a slice of the cooked meat, or maybe some crackers and cheese. Since you are late in the pregnancy, large meals are not a good idea anyways. These ideas will allow you to graze through the evening.
Once you have your baby, I'd suggest continuing this practise, as you will need to grab food when you can. Then, when your baby is older, there will be healthy snack options available at all times. This will reduce the amount of "junk" food your child gets and it is budget-friendly. Good luck!