Cervical mucus & your Peak day

Cervical mucus is produced in response to estrogen and is the most reliable day-to-day sign of your fertile window. It typically progresses from dry, to tacky, to stretchy and clear like raw egg white.

Your Peak day is the last day you notice the most fertile-quality mucus. Ovulation usually happens within a day of it, which is why Peak anchors the timing of everything downstream.