Ovulation day?

Alyssa • Boy Mom ☺️💙🐶 Dog Mom

Anyone know which day would be considered “ovulation day?” I know not to trust the app but judging by my test strips I’m assuming it alums be CD 18 being my peak was around 6am on CD 17. I would have had the best chance of getting preg from that time up until 6pm or possibly later that night right? I know I’m crazy trying to calculate so much but it’s so hard to judge your actual ovulation day.