So confused!

So, here's the story. 
Was supposed to start my period 3 days ago. 
Had sex 5 days ago. No birth control, no condom, he "came" inside me. 
Took a first response (6 days sooner) test and negative. Actually I've taken 4. 
Can you get pregnant 2 days before your period? If so, when will a test show it? 
I'm so confused. I don't feel any odd symptoms other than extreme sex drive. 

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