baby flutters at 13w3d ?!

Destin • Pregnant with a rainbow baby ! Angel baby : (Olivia Jade)
I know I think I might be going crazy but for the first time just a second ago, I was lying on my back and I was on my phone. I suddenly felt a little flutter. It was very faint so I was insure. I quickly ignored it and went back to what I was doing. It happened again but not as faintly. I know it isn't gas. Is this possible or am I going insane???