How can I tell if I ovulated based on progesterone?

A sustained basal body temperature rise of 0.2–0.5°C for at least 3 days after a suspected ovulation day strongly suggests progesterone production from a corpus luteum. A serum progesterone level above 3 ng/mL confirms ovulation occurred; levels above 10 ng/mL suggest adequate luteal function.

Does progesterone affect mood?

Yes. Progesterone is converted to allopregnanolone, a neurosteroid that modulates GABA receptors. For most people, this produces a calming effect. In some — particularly those with PMDD — the brain's response to allopregnanolone is abnormal, producing anxiety, irritability, or depression instead.

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Progesterone and Your Menstrual Cycle

Progesterone rises after ovulation and governs the luteal phase of the menstrual cycle. Understanding what progesterone does in each phase — and what low levels signal — helps you interpret your cycle data.

Progesterone is the hormone that defines the second half of the menstrual cycle. It is produced almost exclusively by the corpus luteum — the structure that forms in the ovary after an egg is released — and its rise and fall create the luteal phase, govern uterine lining stability, and produce many of the physical sensations associated with the premenstrual window. This article is for educational purposes and is not medical advice. Consult a healthcare provider for diagnosis or treatment. Progesterone by Cycle Phase Menstrual phase (Days 1–5): Progesterone is at its lowest. The corpus luteum from the previous cycle has fully degraded, and the drop in progesterone is what triggered the period. Levels are typically below 1 ng/mL. Follicular phase (Days 1–13): Progesterone remains low throughout this phase. Estrogen is the dominant hormone, driving follicle development and uterine lining growth. Progesterone's role here is minimal — it stays at baseline until ovulation occurs. Ovulation (around Day 14): The LH surge triggers egg release and transforms the emptied follicle into the corpus luteum. Within 24–48 hours of ovulation, progesterone begins rising measurably. Luteal phase (Days