Understanding Your Cycle

How to keep a period diary

Menstrual cycle tracking starts with a record of your period dates. In a period log, note when bleeding starts and ends, your flow, and symptoms such as cramps. You can also record mood, energy, sleep, and personal notes to help you notice patterns over time.

Use your period history for better health conversations

A menstrual cycle tracker helps you keep your observations together. Your symptom diary and cycle report can support a conversation with your healthcare professional about changes, pain, or irregular periods. You can also learn about PMOS (formerly PCOS) and irregular cycles.

Predicted period dates and fertile windows are estimates, not medical certainties. Period tracking cannot diagnose a condition or pregnancy, confirm ovulation, or serve as a standalone method of pregnancy prevention. Seek prompt medical assessment for severe pain, unusually heavy bleeding, fainting, or sudden concerning symptoms.