Am I feeling my baby?

When I'm standing up and then sit down, or lay down, I can feel a pressure in my lower belly, sometimes for a second or two, sometimes for a minute or so. Other times, I feel it when I'm standing. I don't know how to explain it besides it feels like something is putting pressure right above my pelvic bone, but very lightly, and it isn't uncomfortable, by any means. Is this what everyone is talking about with butterflies?