What could be wrong if you have not had your period in 6 months but the past two months you have had brown spotting for about 3 days and all tests have been negative?
I do know that the best thing you could do, is get yourself off to a gynae. A blood test for starters will clear any questions of pregnancy, although I think you might have noticed some oher signs of that by now. There are many conditions that affect your period, such as Poly-cystic -ovarian syndrome, fibrocytis, and emdrometrosis. Not to say that you have any of them, but this sounds like it's time to get a check up. Good luck!