Quick Ovulation Question...

Alexsis

I'm new to <a href="https://play.google.com/store/apps/details?id=com.glow.android">tracking ovulation</a>. I bought some ovulation tests and I want to know when i should use them. I dont want to waste them. Im currently 38 days late ....and no sign of AF, but could I still ovulate? Or should I just wait until my period arrives to track after that.. Im just lost 😬