Yawning and stretching.....

Fabi
As I woke up this morning my baby was moving already I could feel him on one side and the other. When I sat up I started to yawn and kind of stretched a little in the process not stretched too far back just the little yawn and stretch you do in the mornings. Well anyway as I did this I felt a sudden pull it hurt a little in my belly it was kind of in the center more towards my right side should I be concerned about this? Or was it just a little pull? I haven't really felt him move since... Please tell me its ok. :-/