On october 29th (the day 6 of my period) i had protected sex with my bf. during it, the condom broke. but he pulled out and no semen got near me. he had precame alot before sex and hadnt ejaculated in days. then on nov 13 (20th day of cycle) we had unprotected sex, once again he did pullout. the next morning i picked up plan b and took it. now yesterday (nov 14 & 21st day of cycle) i have been experiencing light brown spotting. my period is due on the 17th and i usually have some brown spotting but it is a little lighter in color than usual. i turned to the internet and it said implantation bleeding, however i usually get this brown spotting before my period, it is just a tiny bit lighter this month. ive found that the chances are pregnancy with precum are slim and especially because in my situation it contained little sperm and i had my period. so am i just overly paranoid, definitely pregnant, or the chance is slim?