How does the syncing work?

🐠Anna🐠
So i've logged my period for the past... 6 months? Every time my period is a day earlier than Glow says it will be. 
My question is, when I log this, does Glow adjust to and learn my cycle as I'm logging it? Will it more correctly predict my future ovulation and period dates?
Or is it stuck with what it generated when I first signed up? :/ 

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