Glow changed my window?

Question

Yesterday Glow changed my fertile window and (expected)period dates by a week, why would it do this? I've been charting my bbt for 3 weeks now, could it be based on that data? Is bbt a reliable way of predicting ovulation?

We're not TTC but we're  not preventing either, the way the window has moved means we had unprotected sex on my most fertile day.

Thanks for any advice

Answer

Thanks for the help. I guess it will keep changing the first couple of months of tracking my bbt until Glow learns what my cycle is

Answer

Tracking your bbt will only tell you if u have ovulated after the fact. And even then, it should really be confirmed with 3 high temps above the cover line

Answer

It is not a 100% accurate tool and should definetly not be used to prevent pregnancy. The app is also not 100% because it doesn't know how your body works, it only gives you a prediction based on what you tell it.

Glow changed my window?

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