Which day do you think I was ovulating?

Nil

Hey everyone! I need a little help. My app told me that I was ovulating on 15th but honestly I was having egg white cm and bad ovulation cramps on 17th. On 15th-16th was also having egg white cm without cramps but ovulation test was not very positive. My tests started to get stronger on 17th-18th and 19th. We bd everyday through my fertile week but as I know your best chance is after the peak test. So I'm wondering maybe we did not do it much, because we stopped on 19th. Last sex was on 19th. Just got confused. Should I trust app, test or my body? Maybe mixing of all! 🤷Here's my ovulation tests. Maybe you can give some comments about my situation. Thanks!