Ovulation hormones and what they do in the ovulatory phase

Four hormones drive what happens around ovulation, and they move in a set order. Follicle-stimulating hormone (FSH) rises early in the cycle and tells one follicle in the ovary to mature. As that follicle grows, it releases more estrogen, and estrogen climbs for days before ovulation. Estrogen peaks about a day before the egg is released.

That peak flips a switch in the pituitary gland, causing a short, sharp surge in luteinizing hormone (LH). Progesterone stays low through all of this, then starts rising once the egg is released. You can see this whole curve on this hormone chart, which maps each hormone day by day. For a plain description of what the ovulatory phase feels like physically, the ovulatory phase page covers that in more detail.

Each hormone sets up the next. FSH builds the follicle, estrogen triggers LH, and LH releases the egg. This whole sequence, from FSH rising to progesterone taking over, plays out over roughly two weeks in a typical cycle.

The direct trigger is the LH surge. For most of the cycle, estrogen keeps LH low through negative feedback: more estrogen, less LH. But once estrogen crosses a certain threshold near the end of the follicular phase, it flips that relationship.

High estrogen briefly pushes the pituitary gland to release a large burst of LH instead of suppressing it. That burst is the LH surge, and it's what makes the follicle rupture and release the egg, usually 24 to 36 hours after the surge begins.

FSH plays a supporting role, since it got the follicle to this point, but LH is the hormone that actually causes ovulation. This is also why ovulation predictor kits work. They measure LH in urine, not estrogen or progesterone, because LH is the most direct and detectable signal that ovulation is about to happen.

Once the egg is released, the ruptured follicle doesn't just disappear. It reorganizes into a temporary structure called the corpus luteum, and that structure starts producing progesterone along with some estrogen. This is the start of the luteal phase, the stretch between ovulation and your next period.

Progesterone keeps rising for about a week, then levels off before falling again if the egg isn't fertilized. If there's no pregnancy, the corpus luteum breaks down roughly 12 to 14 days after ovulation. Progesterone and estrogen both drop, and that drop is what triggers your period.

The luteal phase covers what that two-week stretch does to your body and mood, and the four phases of the menstrual cycle lays out how this phase fits with the rest of the cycle. In short, ovulation hands off from estrogen-driven growth to progesterone-driven maintenance.

Progesterone itself doesn't act on the brain directly the way you might expect. Your body breaks it down into a byproduct called allopregnanolone, and that byproduct acts on GABA-A receptors, the same receptors targeted by anti-anxiety medications. In most people, that has a calming effect.

But research on hormone sensitivity suggests some brains respond differently to the exact same allopregnanolone levels, their progesterone level is normal; it's their neural response to it that differs (Not Broken, Just Sensitive, 2026). This is the same byproduct and receptor system researchers look at when studying PMDD, where normal hormone swings prompt an outsized reaction instead of a muted one.

Separately, a meta-analysis found that higher progesterone is linked to more negative memory recall, especially under stress, while estrogen is linked to better fear-extinction recall (Neuroscience and Biobehavioral Reviews, 2021). So the rise in progesterone after ovulation can shift mood and memory for some people and barely register for others. It's a difference in sensitivity.

Estrogen and progesterone also act on brain regions involved in mood, memory and stress response. A large review of the hormone axis behind mood disorders found that women with PMDD tend to have lower luteal estradiol than women without it, pointing to a real biological difference (Frontiers in Neuroendocrinology, 2021) (Frontiers in Neuroendocrinology, 2021).

That means the sharp estrogen rise and fall around ovulation, and the progesterone rise that follows, can register as anxiety, low mood, breast tenderness or a short temper, depending on how sensitive your particular brain is to those shifts. Ovulation mood changes and ovulation symptoms go into the specific patterns people notice.

Niyora is a PMS and PMDD support app. If you notice your mood swinging hard around ovulation or in the days after, Niyora's Moon lets you write down what happened, see it from another angle, and draft what you want to say once you feel steadier.

Yes, with some limits. Over-the-counter ovulation predictor kits test LH in urine and are the easiest way to catch the actual surge, usually a day or two before ovulation. Basal body temperature charting works differently: it shows a small rise after ovulation, once progesterone is already up, so it confirms ovulation happened rather than predicting it.

A blood progesterone test, often done about a week after suspected ovulation, can confirm that an egg was released. Testing estrogen or a full hormone panel usually needs a doctor's order and is more useful for investigating irregular cycles or fertility concerns than for everyday tracking.

If you'd rather estimate where you are without lab work, the cycle phase calculator gives a rough estimate based on your cycle length and period dates.