This or that!?

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I am currently using two apps on my phone to help conceive. Obviously glow and the other one is Ovia. Glow tells me that I am ovulating and my fertile window is today - Monday. Ovia says that my fertile window doesn't start until Thursday. How do I know which is correct ?????? HELP

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Glow is here for you on your path to pregnancy

Glow helps you navigate your fertility journey with smart tools, personalized insights, and guidance from medical experts who understand what matters most.

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