Brownish discharge

I've been on birth control pills for 7 years now and me and my boyfriend(of a 1 year and 7 months) had unprotected sex like we always do last thursday two times and we was lacking lubrication a lil bit. So the next day i started seeing like a lil browish...

discharge and i didn't pay it much mind but now it's getting just a lil bit heavier but i haven't experience any itching, burning, i don't hurt or nothing like that my vagina is acting normal except for this discharge im having but my period does come on next week but i haven't missed taking any of my birth control pills and i was wondering could it be something serious wrong because this is a first for me.

it was some soreness afterwards we had sex and it doesn't have an smell that's why im wondering what it is?

it could be Implantation bleeding a sign of pregnancy it just a tiny bit of blood in discharge last 1-3 days the blood can be brown/pink.