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Explore perimenopause symptoms, changing ovulation and estrogen patterns, testing limitations, and the changes worth discussing with a clinician.

Learn what progesterone does, why symptoms cannot diagnose a deficiency, and how ovulation timing changes the meaning of a progesterone test.

Learn what happens during the luteal phase, why progesterone rises after ovulation, and what premenstrual symptoms and testing can tell you.

Understand the menstrual cycle phases, how estrogen and progesterone change, and why your own cycle may look different from a 28-day chart.