Damn you day of ovulation! Why so ambiguous?

So on Saturday I had, in the evening, what felt like mittleschmirtz. A left-sided, localized, pretty sharp pain for maybe 15 seconds or so. I was away from home so couldn't do OPK until I got home. When I got home took OPK and the lines were equally as dark - a positive.  (Before this the test line was always faint).
The next day (Sunday) took OPK and the test line was even darker. 
So which day was ovulation?! Of course, I'm hoping it was Saturday so I can be 2 dpo already 😂😂😂

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