freaked out!!!

Sabina
I was expectin my period. But its my 3rd!!! Day!! Late . Took 2 pregnancy tests they both negative. 
Also did home pregnancy tests apparently negative
My period has been always right on time never delayed . 
But on thursday my bf finished inside me. And my period was due sunday. Last thing to do is go to the doctor but I think Ill pass out if its positive. Im very concerned since everything is testin negative.
Any opinions??? PLEASEE comment as much as you can . HELP :(:(