I had my period for 3 months (last week of Nov 2012 - First week of Feb 2013), from 2nd week of Feb - Now, my period hasn't come yet, it's almost 2 months . We had unprotected sex after my period. I did pregnancy test 3 weeks ago and it's negative.   I feel so bloated, my tummy is so big, looks like i'm 3 months preggy, feel so tired always, slight cramping, back pains, sometimes i feel i wanna vomit but nothing comes out. I'm worried that this might be serious.