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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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Strange Pre-Menstrual Dreams - Visual guide exploring the mystery and hormonal influences behind unusual dreams before menstruation.
The reasons behind our sometimes surreal, vivid, and emotional dreams have long been a mystery. Many people who menstruate report having odd, striking dreams right before menstruation. The reasons behind this phenomenon are hidden in our hormones.
Visualizing Influence: The Impact of Hormones During the Menstrual Cycle.
Reproductive-age women experience a menstrual cycle roughly every month. This cyclical process is connected to all the other systems that keep our bodies running and support our capacity for reproduction. The menstrual cycle is sensitive to the other changes that occur in our lives—environmental, emotional, or other.
Emotional Changes on My Period - Visual guide acknowledging and normalizing emotional fluctuations during the menstrual cycle.
The premenstrual and menstrual phase often comes with less than desirable emotional effects. Discussing emotions and the menstrual cycle can be tricky, as women continue to be shamed and dismissed for expressing our feelings, making it easier to ignore or downplay women’s lived experiences. Experiencing emotional changes over the course of your menstrual cycle is completely normal — up to a certain point — so let's explore what exactly happens during PMS and the other phases of your cycle.