How do I know when I am ovulating?

Ve

Hi ladies, can y'all help me?! How do I know I am ovulating with my cervical mucus? I have never known how to k ow when I am fertile or ovulating. Please help!! I had a miscarriage in Jan and a D&C; in feb.we have sex on the days that I'm in my fertile window snd ovulation day. I use <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">period tracker</a> too and glow. But glow is always like 2 weeks off from my ovulation I think . Idk lol.. please help