Me and my boyfriend had unprotacted sex whilst I was on my last period (12th oct). on monday the 20th october I had brown discharge, which I have never had before. I looked this up on the internet and I read some stuff on implantation bleeding, I convinced myself that I was pregnant. I was due on last thursday (7th nov) but didnt come on. but I have come on today (11th nov). is there any chance I could be pregnant? If not, then what was the brown discharge. Oh and iv never been on the pill so that does not enter the situation.