GLOW VS OVIA ultimate smack down

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So I’m using Glow and Ovia to track my fertility windows and they’re always off by a few days, even when I input the same data. Today on Glow is supposedly the last day of my FW with an 8% chance of conceiving. On Ovia, I have two more days, and my fertility score is 9.5/10. In your experience, which is more accurate? Glow or Ovia? We did the sloppy slappy this morning regardless. Just curious. Baby dust to all! 😊