True or False?

You know how people say dogs & babies can sense things, like if you're pregnant? I wonder how much truth is to that, because me & my SO are trying for another. Earlier today as we were sitting on the couch with our one year old son between us, he turns to me and pulls my shirt up right under my breast and lays his head on my stomach and starts to rub it. He continued to do it for 15 minutes while watching cartoons until he got distracted. Have any of you ladies experienced your babies sensing a pregnancy?