Light brown discharge

It's been about a week after my period, why is my discharge light brown? It's like light brown discharge when I wipe after I pee. Does it mean I'm about to ovulate? Or my period is coming!? It can't be implantation cuz I didn't even have sex? I'm just waiting for my ovulation day to try but I have not been consistent with doing OPKs and I usually ovulate on CD 17-18! Ugh, I don't understand. Am I out the door already? Did I miss my ovulation?