Am i pregnant ?

I started college in the fall around the same time i started havin . after a while i began to see a change in my weight, eating habits, sleeping, and tenderness in my . I can hardly wear any of my old clothes because the excess weight in my stomach, waist area, and my have grown. my period was regular up until september, in october it was earlier and a lil light in november it was late but came for only a day.. i've taken two HPT they both were negative. people tel me i should go to the doctor. before all of this i had never had these problems.. which is really startin to freak me out