Pregnancy Scare???

Okay so I was getting brown discharge (a common thing lately) then I had unprotected sex and it stopped. Do you think it could be that I'm pregnant? According to this app I was supposed to get my period yesterday but I've only logged 1 period so far so idk how accurate it is. I had unprotected sex a week ago, would I have any symptoms to help decide if I am pregnant? I can't take a test for another week because I'm on family vacation. Thanks for all the input :)