ovulation

I know very well that the tests are negative until the line is equal to or darker than the control line, but unfortunately I started the sticks on the 15th day of my cycle, theoretically my ovulation according to the application should have occurred on February 9th on the 14th day of my cycle, and in fact on Sunday February 9th I felt heaviness in my left ovary and light cramps, the same thing happened on the evening of February 13th, now I ask for advice, in your opinion what was the day of my ovulation according to the result of these sticks? around February 12-13? or did it happen before and I missed it?