Is your Glow off?

PrettyBell08

So, glow has been totally wrong with period dates and ovulation etc... last cycle I ovulated (tested positive) four days before glow said I should be ovulating and it’s been about the same each cycle with my ovulation happening on cycle days 9-12 but glow never says that and I honestly thought this time around I was pregnant 🤰🏾 because glow said my period was four days late and I test yesterday to a bfn and today aunt flow shows 🥺

... Im just wondering why glows predictions are so off😕 is anyone else having this issue?