Opk. faint line...but...

Penelope
So glow says my fertile week is next week. I been taking ovulation tests and getting a faint but pretty obvious line the past two days. Hope glow isn't off again like it was with my period and I'm missing my window. I highly recommend testing after AF. You just never know...don't rely on glow alone ladies you might miss your opportunity. Pretty frustrating...anyone else predictions been off lately?