Groundnut is the best budget protein honestly, way cheaper than fancy nuts. I ate roasted moongphali daily and it kept me full. Just dont overdo the salted masala ones, plain roasted is best.
We eat groundnut a lot and it's perfectly fine in pregnancy. My amma made groundnut chikki for energy. Just have it in normal amounts and you'll be good.
Yes groundnuts are totally fine and a good cheap source of protein and healthy fat. I roasted a handful for evening snacks. Unless you have a peanut allergy, no reason to avoid them.