Should I be concerned? TMI

I am sorry about this. I just need someone else's opinion before I go to the doctors. I have about 3 days til my next period and usually I wouldn't really concern myself with brown discharge. The thing is, I've had this show up on my panty liner for the last 2 weeks now. Should I be concerned, or has someone else had this? Also, I'm still a virgin, so not a sign of pregnancy. And I started birth control around 6ish months ago. I don't know if that helps come up with an explanation, but while I was googling, it said something about birth control, and pregnancy. Should I wait til my period is over and see if it continues before I go to the doctor?