I've been having unprotected sex with my fiancé. My last period Was September 19. The brown discharge/spotting has been going on for 5 days now. It's only when I pee and when I wipe. Not enough to fill up a pad a day.. Any ideas?

Might be due to an off cycle, but since you have been having unprotected sex it would be wise to try a pregnancy test as an unusual "period" can be an early sign of pregnancy.