17w6d--Was that the baby?

It was a really weird feeling that I had today. I kept feeling a sharp pain under my left rib cage. It happened several time throughout the day, but it was not consistent. DM said it was possibly the baby moving and that when she was preggo she felt a pain under her left rib where the baby was getting her. I will be looking for this to happen again, otherwise, I'm guessing, it was just air or something.