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Free mini-course · 6 parts

Understanding Your Cycle

A free 6-part course on cycle literacy — the four phases, what's normal, real ovulation math, PMS and PMDD, and keeping your cycle data private.

Self-paced and completely free — each lesson is a ~10-minute read and ends with one concrete exercise. All lessons are live. Part of the Cycle & Menstrual Health hub.

Start lesson 1

The lessons

  1. The Four Phases of Your Menstrual Cycle, Properly ExplainedThe menstrual cycle is far more than a monthly timer. Understanding its four distinct phases — and why the textbook 28-day model misleads most people — is the foundation of real cycle literacy.Available now — read lesson 1
  2. What Is a "Normal" Cycle? (Wider Than You Think)Most cycles that people worry about fall comfortably within the normal clinical range. Here is what that range actually is — and the small set of patterns that genuinely warrant medical attention.Available now — read lesson 2
  3. Ovulation and the Fertile Window: The Real MathThe fertile window is six days long, sperm survive up to five of them, and ovulation rarely happens on day 14. Here is the biology — and a frank note on what tracking apps can and cannot do.Available now — read lesson 3
  4. PMS, PMDD and the Luteal Phase: What's Actually HappeningFeeling worse in the two weeks before your period is not in your head — there is a clear hormonal mechanism. Here is what it is, what helps, and when PMS becomes something clinically different.Available now — read lesson 4
  5. Your Cycle Data Is Medical Data: Privacy 101Cycle data can reveal pregnancy, fertility, health conditions, and reproductive intentions. Here is why it deserves the same care as your most sensitive medical records — and what to look for in an app.Available now — read lesson 5
  6. Tracking Your Cycle for Insight: Making Your Data UsefulTracking your cycle becomes genuinely useful only when you know what to log, why each field matters, and how to read three cycles of data rather than just accumulate it.Available now — read lesson 6

Practice each lesson in Marigold

Every lesson ends with a small exercise — the app is where it becomes a daily practice. Marigold is a private, offline period & cycle tracker for Android with clear predictions and a beautifully labeled cycle ring. No account, no cloud.

  • Free
  • No account
  • Works offline
  • No ads
Coming soon toGoogle Play