My period is 2 weeks late, but all tests are negative

I'm on birth control...have taken all my pills this month, my boyfriend pulls out during sex, however.. I am a little over 2 weeks late on my period, I have bad abdominal cramps, frequent urination, sensitive nipples, headaches, and extreme fatique. I have taken 5 tests and they are all negative, yet I have never ever had a late period nor does my period bring excessive urination or fatique...

Could I be pregnant??