How do I know when I'm ovulating

The app says today 9/1/19 is my 33% chance of conceiving. My cm is a bit like jelly but i am really wet down below and I'm getting really sharp pains from the bottom of my lady parts to the bottom of my belly button. More towards the left side of my body.

Is this a sign of ovulating and should me and my partner do the deed ??

Any help appreciated