Havent gotten my period for about 2 months ...but i am irregular could i be prego?

well i havent gotten my period for about 2moths but i am irregular the last time i got my period was around july31, 2008 i took a test and came out neggative but i still have not gotten my period ...and i am startin to feel little could i be prego and my uturis is growing ...or will i start my period? because in my first pregnacy i started to get some cramps but i alrety knew i was prego and i was @ 3 to 4 months