Carol is not pregnant. You know that for sure. OK, maybe she is. But if she is, then she never displayed any sign, like morning sickness, so that you can know.
But her tummy has been growing, and she looks the least worried. A year ago, when you were dating, and you had a thing for nyama choma and beer, she hated your extended belly to a point of paying a gym subscription for you. You took it positively. You worked yourself out and in a few months, you were in a rude good shape. There was world peace.