I like to offer tofu to my pregnant, nursing, and growing rats. It helps provide them with extra nutrition and seems to help the moms maintain weight while helping the babies grow up big and strong. Other good foods to offer include cooked brown rice or other grains, cooked egg, liver, or soy milk (I've also heard of people offering almond milk, but I personally have not tried it). The key is to offer a variety of foods and offer balance. Don't focus too much on one food, or you can throw the nutrition off. While grains and soy are a great source of protein and some minerals, it does not have the proper balance of phosphorus and calcium, so offer additional foods (such as dark leafy greens, i.e. spinach, kale, broccoli) to balance that out. Protein is important for pregnant and nursing moms, but so are the other nutrients, as well as healthy calories. This is especially true during lactation (not so much during pregnancy, you don't want to bulk them up too much too early in the pregnancy), when a rat can require 300-400 or more (depending on litter size) extra calories per day to maintain her weight while feeding her babies.
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