HELPPP ovulation!

Idk much about ovulation & ovulating & I know that usually <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a>/ Glow can be wrong & aren’t totally correct about when you ovulate, that it’s a prediction but

1.) How do I know if I even am ovulating? Like if I’m actually ovulating every month??

2.) What causes you to stop ovulating or DELAY ovulating BESIDES being on BC ??