When Did I Ovulate?

Kate • 33. Canadian. TTC #1 since Aug. 2014. PCOS. MC in June 2016. Uterine septum and ovarian cyst removed January 2017. Started Metformin January 2018.
From top, starts at CD12, last is from today - CD19. I think the surge was CD 18. Do you agree? 
​Thanks for your help! ?