Implantation or Early Period?

I know there’s a million questions out there like this one, but I need support. I ovulated on CD13, BD of course. But on 6dpo, I noticed 2 small tinges of pinkish red in the shower. But then today (7dpo) it’s enough for a liner as if a “light day” of my period. But AF isn’t supposed to show for another 10/11 days. I have regular periods with a 28-day cycle give or take, so if it really is my period, that would mean it is starting at day 18 which is so not normal for me. I’m just so confused! Any feedback?