I started feeling "flutters" at 15w. Kind of felt like my stomach growling? But it was much lower (I'm carrying low) where she is. Then about 17 weeks I felt "popcorn". Kind of a more obvious tapping in the same spot. 18 weeks I felt like someone flicked my stomach with their fingers, but from the inside. I felt that through to my hand on top. Now at 20w they are a little harder. Hope that helps!
It can feel like popcorn popping or butterflies! How are you feeling