Brown discharge 4 days after period

Is this completely normal? My period ended 4 days ago. Just a while ago after taking a shower and putting clothes on i felt liquid come out my V. I didnt check it until i had to pee and when i saw it, it was a brown discharge. My boyfriend and I had an unprotected sex just 2 days after my period. I dont think i might be pregnant. If ever i am, symptoms couldnt be this early, right? I dont experience any pain at all. I need advice please. Im scared i might be pregnant and i am not ready.