I have irregular periods & about 2 months ago I stopped the pill. Last month I got my period on the 15th & I had unprotected sex a few times while I should have been ovulating. I went to the doctors last week & this week & got a test done, it was negative. But my nipples are extremely sensitive, & so are my boobs, I have never experienced any breast pain this bad before. Could I possibly be pregnant? Where the tests taken to soon? I should have gotten my period yesterday, but I still don't have it..

Yes the tests were taken too soon. If you were due yesterday you should wait about 2 weeks.