What Causes Light Bleeding After Having Unprotected Sex?

I am suppose to get my period next week or so and me and my boyfriend have alot of sex. We never use protection. And we are letting nature take it's course for getting pregnant. Since this morning I've went pee and when I wiped it's been a reddish tint like blood for my period but it almOst 815 and it's still the same thing am I pregnant?