When do I actually ovulate?

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Hey guys, so I took the non positive test yesterday morning, then later in the night maybe 2 hours approaching midnight I had this feeling that I was ovulating, however I brushed it off cos I had a negative in the morning. Early in the morning, I had this super positive in which the line is even darker than the one given.

When do I ovulate? Have I ovulated yesterday night? Or I do still have 24h since yesterday night until ovulation happen?