bleeding 2 weeks after period

my last period ended on either OCT 30 or 31, and I had (pull out method) sex on the night of the 31. Two weeks later (the last couple of days) I had spotting. Bright red, yes...but inconsistent. It comes and goes. I know they say implantation bleeding is very light and hardly noticeable, but I also know that not everyone's symptoms and experiences are the same. It had never occurred to me that I might possibly get pregnant, nor was I hoping to, therefore I know my symptoms weren't all created in my head. But intuition told me I was pregnant before I had any reason to even consider the thought. What do you think? Any opinions are very much welcome!