Baby movement?!? ??

​I'm 16 weeks and thought it would be too early. This is my first baby. But today I was sitting in a quiet room at work just looking out the window when I felt something to the left of my stomach which I know baby always lays that side cause I can feel like a hard ball sometimes. So anyway it felt like a butterfly flapping it's wings but on the inside?? Deffo not gas before anyone says that lol but could this be movement??