Implantation Bleeding?

El

I'm having very light pink spotting only when I wipe. I was supposed to ovulate on the 9th but got all negative OPKs from 7th until today (I only test once a day though). I never got anything close to a positive though. Can you spike and go back to very faint lines within 24 hours? AF isn't due for 10 more days at least. Any insight is helpful.