WHAT: CM stands for Cervical Mucus.

WHY: Monitoring your cervical mucus plays an important part of determining your fertility and in helping Glow work for you. During the course of a woman’s menstrual cycle, cervical mucus changes in both quantity and quality. Glow incorporates these changes into your daily fertility score.

HOW: You can check your CM by inserting one clean finger into your vagina. When you remove your finger, observe the consistency of whatever mucus you find. If the secretions you observe are wet, slippery, and stretchy, then you are likely at your most fertile.