Why is there more fertile mucus?

Fertile mucus is more abundant during the ovulatory phase of the menstrual cycle due to hormonal changes, particularly the increase in estrogen levels. This type of mucus is thinner, clearer, and more stretchy, which facilitates sperm movement and survival, enhancing the chances of conception. The body's preparation for potential fertilization and implantation of an embryo drives this increase in fertile mucus production.