Hi there. Well, I'm not sure if you'd be feeling movement this early so would say that is not really a symptom. Could you have gas?? When a baby begins moving, it feels like flutters. It took me a long time to realize it was my baby moving as it wasn't what I expected.
Anyway, you've taken two pregnancy tests that are negative which is a really good sign that you are not pregnant. However, you feel something is going on so it would be wise to see your regular doctor (or go to a clinic) to discuss this. Good luck
None of us can answer this for you if tests are saying negative then go to the doctors