Could be pregnant, but it's a bit soon to be showing the belly if she was bred in October. Goats carry the kids on the right side. You can eventually gently bump them and feel them there.
Pygmys and Nigerian dwarf can get fat easy especially when fed grain. They also can get a coat that makes them look bigger. I would feel along the spine to see how thick or thin she feels. Check the eye rims to see how pink she is and definitely check the thinner one. That will help determine if they need worming.
Also in winter when goats are eating hay the rumen will be bigger because it's digesting all that roughage. The rumen is on the left side of a goat.
I definitely would watch for mammary development, but you wouldn't see anything until late February and into March depending on when she was bred in October.
When bloated they will stop eating and drinking, and will stand hunched up, and usually vocalizing from the pain. It's best to always offer baking soda free choice to help prevent bloat.