Help!

Hannah • Baby due Mar 2022

So, I’ve had a strict 28 day cycle for as long as I can remember. My period comes like clockwork give or take a day. But glow predicted my O day 5 days ago, I randomly decided to take a OPK today (for the first time) and it’s blazing positive. Will my period come later than the 28 days now? Sorry, this is my first time TTC and this all confuses me.