I can personally tell when Im ovulating because I get terrible abdominal cramps and my opks are positive for a few hours in the middle of my cycle. After a few hours the cramps vanish and my opks are negative. I’ve verified a few times by going in to get an U/S.

Bloodwork and/or ultrasound

There is no way you can actually tell when an egg is being released. You can try using ovulation tests and when you get a positive ovulation should occur anywhere from 24-48 hours later. Another way to check if you ovulate is through ultrasound monitoring (but that usually happens in cases of fertility treatments) or bloodwork that can confirm you ovulated.