When did I ovulate??

This is my first month trying to track my ovulation. I bought pregmate ovulation strips and started testing about a week and a half ago.

All tests were negative until CD 15, as shown in the picture. That same day I had a lot of dull cramps and a lot of stretchy ewcm.

CD 16 I still had a positive test but now I had a lot of thin milky white discharge.

Yesterday, CD 17, I finally was back to negative. I’m still having a lot of discharge, though, and it’s still kind of stretchy at times.

Is there any way of knowing when I ovulated based on just this?

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