Could i be pregnant?? please help !! ?

I was on the pill for 3 1/2 years and recently went off in may. Well for some dumb reason me and my bf started having un protected sex he never busted his load in me we used the pull and pray method well I went off the pill may 3rd and had sex a few times one time in particular was right before I got a period I started June 3rd I was about 5 days late and it lasted a good 5 or 6 days well 2 days before my period ended we had unprotected sex again and sense then I have felt like total crap ! My boobs hurt so bad and they got bigger they were swollen but not as bas they just hurt I've been so dizzy and nausated no energy I've Been getting headaches weird cramping and discharging alot too I took 2 tests and they came back negative I'm still not convinced I haven't felt good since Friday please help !