Do dogs know that people are pregnant?

Does dogs know that people are pregnant? Human hormones will change during pregnancy, and the hormones and pheromones in pregnant women will change. The dog's sense of smell is very sensitive and can smell the smell emitted by the owner that is different from usual, so the dog can know that the person is pregnant. Through changes in the owner's mood, behavior, and body shape, the dog can also sense that the owner is pregnant. When the dog is close to the owner's belly, the dog can even sense the baby's movements.