They say a lopsided belly is often a sign of pregnancy, but with her markings that appearance could be misleading.
She's still fluffy enough that it is hard to tell if she is heavy all over or just her belly.
When you get a chance to lay your hands on her, feel her spine, hips and ribs; there should be a light layer of flesh between her bones and your fingers. [Press to feel bone, she's too chonky. Easy to feel bone, she's likely too thin; since there is a chance for pregnancy the feel will be a bit different, as she could be "ribby" due to baby pulling down, so check spine and hips for coverage.] Her neck looks a little thick, but that could be the winter fluff and pic angles.