a weird thing just happened

Hey I'm 11+2 weeks. I was laying down on my back and I was resting my hand on my stomach and then I felt this weird feeling on the inside like something was moving under my hand. I've never felt anything like that before. But I shouldn't be able to feel that, not yet. I got so fascinated so I yelled to my bf that he had to hurry and come feel and he felt it as well. It wasn't my imagination. Something was actually moving! Anyone who has experienced the same? Or does anyone have any idea what it might have been?