How to pick ur ovulation day!!

I came across this site while trying to figure out when I actually ovulate....and it says that u ovulate 2days AFTER ur highest peak!! So it ur highest peak is 33% then goes to 28% then suddenly drops to 5%, the day it's at 5% is ur actual ovulation day! Here's a screen shot. I found it on google: Ov Watch American pregnancy Association. I found it very interesting! Any1 who has found anything similar feel free to share also! Baby dust to every1 ​