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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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Understanding the Impact of Cannabis on Menstruation: Exploring How Marijuana Influences the Menstrual Cycle.
Cannabis and the various products derived from it are slowly becoming legal for recreational and medicinal uses in many places around the world. The painkilling and relaxing properties of cannabis make it an enticing option for the treatment of menstrual pain and PMS-related symptoms. Interestingly, many women report noticing differences in the effect produced by cannabis products depending on where they are in the menstrual cycle. While research on the effects of cannabinoids—the active substances in the cannabis plant—is still ongoing, it is clear that the menstrual cycle has an effect on how a woman’s body reacts to outside influences, especially in the case of potentially addictive and psychoactive substances.
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.
Understanding the risks and benefits of the Free Bleeding Movement and its impact on menstrual health and feminine hygiene.
Menstruation—is it a blessing, a curse, or an inconvenience? Regardless of how we choose to look at it, menstruation is a sign of reproductive health. Some women are now choosing to embrace the natural flow of their period blood.