Major ovulation confusion

So I am ttc and Glow says that I ovulated on the 7th or 8th but 2 kids later and from experience I am almost certain that I ovulated on the 3rd or 4th because when we had sex on the 3rd I had stretchy clear CM and on the 6th I noticed my CM was white, sticky, and like lotion and I know that usually means that ovulation is ending or is over. Also on the 9th after wiping I noticed a dark red brownish spot on the tissue but nothing after that. Has Glow been wrong or off with your ovulation dates? Or have you ovulated earlier than expected? Please share your stories...I just really hope we didn't miss our opportunity.