Ovulation predictor

Jessa 🌴
It's my first time trying " ovulation Predictor" today is my 3rd Fertil day but on the glow calendar it says my most Fertil day is Sunday. How do I know if I am ovulating? So what does this ovulation predictor means? Am I ovulating already or not yet. Help! Please their is two lines but the second one is very light. xoxox Thank You 💕