How can i track ovulation to stop me getting pregnant?

Emma

I've come off birth control as it's not relly for me an I've heard people <a href="https://play.google.com/store/apps/details?id=com.glow.android">tracking ovulation</a> so that know to not have sex an stuff bit how did i do that ? I haven't even had any symptoms or discharge this month but I feel as it's only my 2nd month coming off the coil my periods are going to be in regular....