Dark discharge 6 days before period

Brittney

I have been trying to get pregnant for a few months now, I have been having a lot of breast tenderness/slight pain this past week and a half, I seem to be more emotional and today I noticed I’m having a good amount of darker colored discharge. It’s not black but more brownish and I don’t start for another 6 days, is this a sign of pregnancy or is this something more normal?