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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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Untangling Delays: Exploring Reasons Behind a Late Period.
A regular period is a sign of overall good health. If it doesn’t arrive when it should, we worry. Most women experience some variability in their menstrual cycles. How familiar are you with yours?
Harmonizing Health: Understanding and Managing Premenstrual Syndrome (PMS).
Headaches. Sore breasts. Mood swings. Irritability. Cramps. Fatigue. Trouble sleeping. Bloating. Food cravings. Acne. PMS is not kind.
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.