Tmi tmi tmi Almost black discharge far from my period

I need help bad. I'm freaking out. The last couple days I've been having occasionally but a lot of almost black discharge with a subtle sour smell. I'm 2 weeks away from my period and I'm on the pill so my period always comes around the same time. I recently had a uti like 2 week ago and also had sex like a week ago after my uti had cleared up. Please help thank you in advance