Ovulation 😃 and question

This might be a little silly to be excited about but this is our first time ttc. I went through tonight and lined them all up only to realize I had been getting +Opks since yesterday. My calendar shows "period" which was withdrawal bleeding from stopping BCP the 11TH. Never thought I'd O so quickly. The third from the bottom is yesterday (26th), the second from bottom is today at noon, and the last is today at 8:20. It looks like I've Od or had +Lh surge since yesterday. Today I had a pinch/cramp in my left pelvic area, before we BDd. Hopefully we did enough BDing cause quite frankly we're exhausted ☺ question is when do start the "# day" of DPO?