Am i pregnant ??

So my period was supposed to get here on the 10th .. I am currently 12 days late and the last time i had sex was 4 weeks ago on june 29. And it was protected sex 
.. yesterday i took two first response pregnancy test which says that it can detect if you're pregnant 6 days before your missed period .. Both of them were negative .. Wtf is going on. ??? I still haven't gottrn my period ! 😓😓😓