Period comes early?

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Is there a way to log on <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> if my period comes early?? Mine is irregular and doesn't match up with the cycle on <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> at times, making it look like I'm late.