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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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Illustration depicting the phenomenon of period poops and its causes.
Periods are messy. They affect our health, moods, and well-being, and they are just annoying to deal with. From painful cramps to pimples and bloating, our hormones just won’t give it a rest. In this article, we look into a little-discussed but common phenomenon—period poops. That’s right, as if bleeding, pain, and mood swings weren’t enough, being locked in your bathroom for hours can be the cherry on top.
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.
Balancing Menstrual Health: Heavy Periods and Menorrhagia.
Far from pleasant—this is how most women would describe their periods—even though menstruation is a completely normal, natural, and more or less regular process. However, menorrhagic menstruation is abnormally heavy bleeding often accompanied by severe cramps.