darker discharge?

[seethroughstars.livejournal.com]

I started taking metronidazol (generic flagyl) on thursday. One of the side effects is darker urine, but I've also noticed that my discharge has been darker. Has anyone taken this and had this experience? It almost looks like I've started my period but I haven't and I've been really good about taking BC the past few days. Also there's no known interaction between this particular antibiotic and bc.