Brown spotting/discharge?

katie
Hey guys! So Im supposed to have my period November 12 and earlier today I used the bathroom and I wiped and I noticed brown discharge and it wasn't alot but it wasn't a small amount. I did have unprotected sex august 31, took many tests and they came out negative. So is there a chance I could br pregnant, or is it just premenstural bleeding? Thanks! 😊🌸