OPK??

Liza • 👦🏻 5/5/16 👼 8/13/18 🌈 👶🏻 12/15/19 👧 12/4/2019 (our 🌈 baby came early) 🤰with baby number 3

So, according to Glow I should be in my fertile week- today is a high percent of fertility- however I took an OPK and it’s low- but very close to being high. My expected ovulation is on the 17th. Has anyone had this happen to them? And if I’m so close to ovulation shouldn’t I have a smiley face on my OPK??