When did I ovulate 🤔🤔🧐

Natuchys

So confusing. It’s my first time using ovulation tests. So I have a pretty long cycle (about 35-37 days). I had cramping on my right side sat night to sun morning (8/17- 8/18). I took the tests below at these times

The <a href="https://play.google.com/store/apps/details?id=com.glow.android">Glow app</a> says I probably ovulated Tuesday the 8/20. Is it normal to have ovulation cramps almost 3 days beforehand ? And also which one is positive?! Lol I’m so lost. How did it look darker at 2pm and then lighter at night and then dark again the next night. 🤔🥴