[Amanggie]

I am 31 yrs. Old and my boyfriend and I are trying to get pregnant for three months now. My first day of last period was June 15th 2011 and I took two tests, one on the 12th and one on the 15th both of which were negative. I have sore breasts, irratability, sleepy and hungry but nothing sounds good and waves of nausea and I have not started my period. So why would the tests come up negative? Am I pregnant or not?