OPK Opinions

So I feel my darkest days were cd 11 & 12. On cd 11 I did notice egg white discharge but I feel my darker test was on cd 12 at 5:32. I notice it was a bit lighter today on cd 13. My question is what would I chart as my actual ovulation day? Also should I stop testing now or keep testing a few days more? This is only my second time testing so I'm very new to it all any help would be appreciated. Tia 😊