Ovulation Earlier Than Glow Prediction?

Hi there. My fiancé and I just recently started TTC. I’ve been using the crap out of this app to track everything, and used it previously for period tracking. I’ve always had a standard 28 day cycle my entire life, never late and never early. We’re using the Shettles Method for a girl, so we have to have sex on certain days prior to ovulation to use that theory. I was scheduled for O tomorrow, but I’ve taken multiple LH tests yesterday and today, both proving to be positive. Should I trust the tests or the calendar?