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Period calculator

Use WomanLog's Period calculator to predict the next period days and to understand your menstrual cycle.

First day of your last menstrual period
How long did it last (days)?
Your average cycle length (days)
How long did it last (days)?
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Your average cycle length (days)
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Woman experiencing emotional symptoms of Premenstrual Dysphoric Disorder (PMDD) during menstrual cycle.
As hormone levels begin to drop after ovulation, most women experience some changes in their physical and mental state such as tender breasts, bloating, or moodiness. Such symptoms are often linked with Premenstrual Syndrome, or PMS. For those of us who suffer from Premenstrual Dysphoric Disorder, or PDD, the symptoms—especially those having to do with emotions—are noticeably more severe.
Image depicting preparation for your first period
When will I get my first period? What are the signs? How will I know? Am I the right age? These questions are important, and the answers will help you prepare for menstruation. In this article, you’ll learn why periods happen in the first place, how to prepare for your first menstruation, and how to talk to your parents about it.
Discovering Effective Relief Strategies for Menstrual Pain.
Shark week. The crimson tide. Riding the cotton pony. The many, creative terms we have for periods offer little comfort when it’s time for dealing with the unpleasantries that accompany it.