The monthly series of hormonal and physiological changes a woman's body goes through to prepare for a potential pregnancy, calculated from day 1 of one period to day 1 of the next.

The release of a mature egg from one of the ovaries, triggered by a surge of luteinizing hormone (LH). This typically occurs around 14 days before the next expected period.

The days in a woman's cycle when pregnancy is biologically possible. It spans approximately six days: the five days before ovulation and ovulation day itself.

A combination of physical and emotional symptoms that occur after ovulation and before the start of a period, resolving once bleeding begins. Linked to progesterone drops.

A common hormonal disorder in women of reproductive age, characterized by irregular periods, excess androgen levels, and polycystic ovaries on ultrasound.

A painful disease where tissue similar to the lining of the uterus grows outside the uterine cavity, often on the ovaries, fallopian tubes, or pelvic lining.

The biological process in which a fertilized egg attaches to the uterine lining, typically occurring 6 to 12 days after conception.

Fluid produced by the cervix that changes in color, volume, and consistency throughout the cycle in response to estrogen, serving as a primary indicator of fertility.

The body's lowest resting temperature, recorded immediately after waking up. It rises slightly (approx. 0.5°F) following ovulation due to progesterone production.