Glow just pushed my day of ovulation back

Danielle • 27 y/o cat mama 😻 happily married💍 to my DH since 06/08/2016, Pregnant with our first child 👶🏻 due November 2019 ❤️🤰🏻

I have been logging my BBT and OPK daily, is this what would cause glow to push the prediction back one day? My OPK results have been confusing too. Line faint then darker then faint again. I’m just confused :(