Help ovulation tracking

Claire

So I have never taken any ovulation tests before but decided to buy some today and took one (8/9) glow predicts ovulation on the 11th so I thought I would at least get a blinking smily face but I got nothing!! Is it possible I missed it? I know ideally I would have started tracking sooner. If you test after ovulation do levels drop quickly? Should I test again tomorrow? Any advice is appreciated!!