Why is glow giving me an early period date

Question

I just had my period at the end of the month and glow is saying I should be on it today, but my other app which is 95% of the time right "off by a day or two" is saying I won't get it by the end of this month.

Answer

I don't ever put in my ovulation date. I just got the app again and updated all of my periods from months before. But thanks for the advice tho

Answer

Perhaps because Glow calculated your period due date based on the ovulation date you put on...and gives you period date, 14 days after ovulation date regardless on when you had your last period and your lenght cycle which varies for each woman. Therefore I would stick to the date you know (number of days that your cycle is regularly) and push manually the period day once you arrive at that day saying you didn't have it yet. For me Glow is wrong by 2 or 3 days. Good luck

Why is glow giving me an early period date

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