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Period tracker, glow, or ovia??

Lindsay • Wed, Aug 19

<a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Period tracker</a> lite says my next period is today, glow and ovia both say my next period is on Friday. Which one should I trust more? When should I test? Does it make much of a difference really?? Thanks!!

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