Our Sources
World Health Organisation (WHO)
WHO Statement on Menstrual Health and Rights
Natural Family Planning
The American College of Obstetricians and Gynecologists (ACOG)
The Menstrual Cycle: Menstruation, Ovulation, and How Pregnancy Occurs
Centers for Disease Control and Prevention (CDC)
Standard Days Method
Female Reproductive System
Heavy Menstrual Bleeding
National Library of Medicine (NLM)
The Normal Menstrual Cycle and the Control of Ovulation
Physiology, Menstrual Cycle
The normal menstrual cycle in women
Journal of Medical Internet Research (JMIR)
Menstrual Cycle Length and Patterns in a Global Cohort of Women Using a Mobile Phone App: Retrospective Cohort Study
Relationship Between the Menstrual Cycle and Timing of Ovulation Revealed by New Protocols: Analysis of Data from a Self-Tracking Health App
American Journal of Epidemiology
Factors Affecting Menstrual Cycle Characteristics