Well, you can do things like lunges, squats - even without weight - at home. Just watch the balance issue that will come into play. You might need to do stationary lunges with one hand on a wall instead of walking lunges. Squats also are fine - with or without weight. If you were not doing squats before PG, then I would stick with no weight. You can even get a stability ball and do wall squats.
Some of it is inevitable. You are seriously fighting genetics here. Genetics CAN be fought, but it is very hard when PG because you have so many limitations on what you can do and what you can/cannot eat. If I were you (and in a way, I am), I would stick with going on walks, doing lunges and squats at home, some Pre-Natal Yoga or Pilates, and do some light (NOT vigorous) stretching. Do something everyday, even if it is only 10 minutes of activity.
As far as food, I know you know to eat balanced diet. You obviously cannot eat a clean BB-style diet, but you CAN limit processed foods. Stick with fresh, whole foods. Heavy on the fruits and veggies, complex carbs, moderate protein and healthy fats.
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