No der is no chance dat i m pregnet bcz i never had sex nd i dnt hve anyother medical problem....
Is there any possibility that you're pregnant? I would suggest making an appointment with a gyn, there are lots of reasons that a period would stop, halt, or change suddenly. Also I think it could be beneficial to get your thyroid tested (because thyroid problems can cause rapid weight gain or loss). Make sure your doctor tests for the free t3 and t4 as they can be a better indicator than TSH about what's going on.