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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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Woman pondering emotions during ovulation: Understanding the link between ovulation and emotional changes.
Have you ever noticed that around the middle of your cycle, your mood changes for a few days? It might be a sign of ovulation symptoms. Although the ovulatory phase of a menstrual cycle is the shortest, it’s also the most significant one.
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.
Harmony in Flux: Navigating the Challenges of Irregular Periods.
The average menstrual cycle lasts 28 days. Our lives impact our hormones, and therefore our cycles—for example, stress can delay your period. Some variation is to be expected, but bigger fluctuations are reason to investigate.