Fertility conversations usually start with the ovaries.
Terms like egg quality. Estrogen. AMH. FSH. Progesterone. But the first decision about whether an egg gets released isn’t made in the ovary at all. Like so many things, it starts upstream, in the feminine brain. Where her mind is constantly taking inventory of the environment and asking a more fundamental question:
Is it safe here?
My nephews and I were on horseback in the hills outside of Yellowstone. It was hot and beautiful. The horses were slow and plodding. And then the guide’s tone of voice changed: “I’m going to need everyone to start shouting and to turn around right now and go back the way we came.”
I was in the middle of the group, the boys were in front of me, closer to the guide. At first we were all just confused and not following what was happening. Then someone said the word “grizzly.”
The mind gets concentrated in a nanosecond. We all started shouting to scare off the bear, as we’d been prepared to do in the safety session before leaving camp. Many of the riders, brand new to steering, struggled to turn their horses around. As an experienced rider, I was focused on circling around the young boys in my care and encouraging them to move quickly without scaring them, while twisting around in the saddle to locate how close the bear was.
It was the guide’s horse that had saved the day. He had detected the danger and pulled up short, alerting us to the problem ahead.
I never did see the bear. Most of the group didn’t. But the awareness of the bear’s presence was enough to set off extreme stress physiology in everyone. Hearts racing. Shallow breathing. Blood pressure spiking. Cortisol carpet-bombing the bloodstream. Liver dumping glucose. Circulation routing to the vitals and away from extremities.
Also, each pair of ovaries in the female riders shutting down.
The bear parted ways with us and we finished our ride peacefully, with a fun story for the dinner table. Thankfully, it takes longer than a few minutes of potential bear attack to destroy an ovulatory cycle. One scare on a trail ride isn’t going to cost you a baby.
But what if the bear isn’t on the trail? What if it’s your husband? Your boss? Your bank account?
Those grizzlies don’t wander off after five minutes. They don’t get bored and amble back into the tree line. They show up again tomorrow, and the day after that. Your body can’t tell the difference between the life-threatening grizzly on a trail and a marriage that’s been running on fumes for three years.
That’s the whole essay, really. Your reproductive system was fearfully and wonderfully made to turn on and off at the answer to one question: is it safe here?
Not safe in the sense of “no immediate physical danger.” Safe in the sense of “I could actually sustain a pregnancy and raise this child to adulthood under these conditions.”
Let’s revisit just how vulnerable and dependent you would be if you were pregnant: hyper-sensitive, hyper-vulnerable, slow to move, extremely tired, often nutritionally depleted/nauseated, in pain from gas, joint pressure, breast tenderness, reassurance-seeking, intensely interested in nesting.
And it’s not just pregnancy.
During birth, your vulnerability is the most intense. The exquisitely orchestrated hormonal process of birth - the dance of catecholamines, oxytocin and other hormones which ensure cervical softening, contraction pacing, movement of the baby, natural pain suppression, uterine closing and hemorrhage prevention immediately after birth - all of this works best when you are alone or near-alone, unobserved, unjudged, with no threats, no sounds, no smells, low light and no anxious or negative energy in your immediate, six-foot field.
After birth, that hormonal symphony continues with oxytocin pulsing every time baby cries or feeds. That hormonal matrix ensures proper development and attachment between mother and baby. It heals mother’s body, regulates baby’s body temperature, turns on the full milk drop, and helps mom integrate the physical earthquake she just experienced - without PTSD.
Guess what turns off oxytocin?
Cortisol.
(I covered the glories of physiological birth and its grotesque saboteur, industrial birth, in detail here.)
Even the slightest insult to this brilliant process - the mere perturbance in the field - signals to the body to turn off all these hormones. Because it’s not safe to do any of this.
And the first time this safety signal is demanded by the body is before conception.
The hormones that control ovulation are excruciatingly attuned to stress.
One grizzly incident, over and done, might be noticed but it won’t shut down ovulation. Your body is designed to weather the coming and going of occasional surprise grizzlies.
But when the stress is chronic and serious - your autonomic nervous system reads that as potential for starvation, abandonment, exile from the tribe, violent attack, and any number of other circumstances that render baby-making, baby-baking, baby-birthing and baby-nursing as too physiologically expensive. Your body knows that all its energy right now needs to be on survival. When survival is at risk, all other biological imperatives take a back seat so that all the body’s resources are directed toward the top priority. Lesser priorities - especially those that are metabolically expensive - get shut down. Things like digestion. Detoxification. Reproduction.
Pregnancy and breastfeeding are two of the most metabolically expensive things a human body can do, and a body under chronic threat triages against a pregnancy it doesn’t believe it can carry to term and support afterward. Your body is a competent risk manager. Here’s what that looks like biologically.
Your ovaries aren’t actually in charge
Ovulation depends on a signal that starts in the brain (not the ovary).
The hypothalamus releases gonadotropin-releasing hormone (GnRH) in careful pulses, which tells the pituitary gland (also in the brain) to release luteinizing hormone (LH) and follicle stimulating hormone (FSH), which work together in the ovary to mature a follicle. A final LH surge pops an egg loose. Each domino in this chain has to fall in the right order and at the right rhythm for ovulation to happen. (Friggin’ miracle it ever does!)
Chronic cortisol interferes with that chain at the very first domino. It suppresses the kisspeptin and GnRH neurons in the hypothalamus, which blunts the pulsing of FSH and LH. No proper pulse, no LH surge. No LH surge, no egg release. Doctors have a name for the extreme version of this: functional hypothalamic amenorrhea - fancy words for “no more periods.” You hear about this with extreme athletes or war refugees.
But amenorrhea is merely the loudest end of a wide continuum. Most women reading this still get a period every month like clockwork and have no idea their cycle is in trouble. That’s because bleeding only proves you made estrogen. It doesn’t prove you ovulated.
A cycle can look completely normal on the calendar and still miss the point entirely. Even when the LH surge is blunted enough that the egg never releases at all, you can still get a withdrawal bleed on schedule when estrogen drops. Or the egg does release, but the corpus luteum that’s supposed to form afterward is weak, so you get a short luteal phase and not enough progesterone to sustain implantation even if fertilization happens. Same 28 days on the calendar, completely different story hormonally.
Sadly, this isn’t a rare glitch.
One study that tracked women with regular, predictable cycles using daily hormone measurements found that more than a third of them failed to reach an ovulatory progesterone threshold in a given cycle. Widen the lens to a full year and roughly two-thirds of normal-weight, regularly-cycling women had at least one cycle with a missed ovulation or an inadequate luteal phase, all while bleeding right on time.
If you’ve been told your labs are “normal” and your cycle is “regular” and you still can’t get pregnant, this very well could be where the real story is happening.
“But women get pregnant during war and rape all the time”
Now you might wonder: if stress really shut down fertility, women in war zones, refugee camps and abusive situations wouldn’t be getting pregnant, and they clearly do, so stress must not actually matter that much.
This conflates two different stressors which your body scores differently in the “is it safe to get pregnant” evaluation.
A single violent event, even a horrific one, is akin to one bear sighting. It’s an acute spike: cortisol floods in, then clears. The hypothalamic suppression described above requires the bear to move in and stay, week after week, month after month. A rape is a devastating acute trauma - a temporary lapse in safety that doesn’t necessarily signal an ongoing threat to survival. It’s not, on its own, the same physiological exposure as living for two years under famine or siege or bombardment or an abuser’s roof.
And if you actually look at the historical record on sustained, chronic conditions, it doesn’t undercut this argument - quite the opposite.
The best-documented case is the Dutch Hunger Winter, the WWII famine in the German-occupied Netherlands, where amenorrhea rates spiked sharply during the famine months. The same pattern has been reported in other sustained famine and siege conditions, like wartime Leningrad, and in long-term refugee and displacement camps: population-level fertility and cycle regularity drop for the duration of the crisis. Individual women still got pregnant in these settings, because some were already mid-cycle when the crisis hit, or because women’s minds perceive the same events differently, and so their bodies suppress reproduction with lots of variability. But across all of these, the base rate moved in precisely the direction chronic stress physiology predicts.
A word to my regular readers
If you’ve read “Your Body Isn’t Out to Kill You,” you already know where I land on this.
Your body isn’t the enemy here. It’s running a protective program to save your life in the immediate term (and therefore your fertility in the longterm). This is the same kind of program that shows up as a lump or a rash or a flare, except this time it’s pointed at your ovaries. I made the fuller case for that framework in that post, so I won’t relitigate it here.
Your body is still your ally, not an adversary: this time, fertility edition.
So where’s the protocol?
I know what some of my Type A sisters want right now. Morning sun, box breathing, magnesium before bed. Fix the cortisol, fix the ovaries, pregnant by spring, amiright?
Doing breathwork while the actual grizzly is still standing in your kitchen isn’t going to deliver the results you want. You can regulate your nervous system beautifully for an hour on a yoga mat, but if you’re not changing the thing your subconscious mind has decided isn’t safe for baby-making, your ovaries won’t be fooled.
The answer isn’t the right supplement stack. And the science was never really the point either.
The reason I spent a few paragraphs above talking science was to demonstrate that your body isn’t crazy, broken, or betraying you out of spite or bad luck. If your reproductive system has shut down without telling you, something in your life is registering as unsafe, even if nothing “bad enough” has happened to justify that word out loud.
I’m not talking about catastrophe. It doesn’t have to be anything that you’d define as “trauma.” Most of the women I know whose bodies are running this program aren’t in danger in any way they’d describe as dramatic. It’s a marriage that’s civil but empty, a job that’s low-grade dread five days a week, a bank account with no buffer, a loneliness so old they’ve stopped noticing.
In my own case, my privileged life with a high-responsibility, high-stakes career, combined with doom-scrolling-induced sleep deprivation, nutrient depletion due to my vending machine diet and Diet Coke habit, and complete disconnection from nature - it all meant that I spent every waking moment of my life in a cortisol bath cooked up by my autonomic nervous system.
Your own reality, the perfectly “normal” life you’ve built on the backs of Gloria Steinem and Susan B. Anthony - the life everyone told you was supposed to feel “liberating” - could very well be at complete odds with biology and its deepest subconscious needs.
Our bodies didn’t get the memo from the Sexual Revolution
When you were a little girl, did you dream of having to pay your share of the bills and taxes, leaving your baby with strangers six weeks postpartum, while your leaky nipples destroy all your power suits?
Because if that’s what having a baby would look like with your current partner, your current life - your subconscious mind may have already told your ovaries that he’s not the one (even if he really is the one!). Your lizard brain isn’t interested in DEI or marital harmony, it wants a strapping, strong, competent provider and protector so you can focus your attention on baby at home - permanently. Your PhD doesn’t get a vote.
On the other end of the spectrum, maybe your marriage is high-conflict, high-drama. Maybe he’s a cheater or a gambler. He may be the strapping stud described above, but your subconscious mind knows he could leave you and baby for the younger, sexier pre-partum crowd at any time. Only you know if this is the program your mind is running.
Maybe you’re chronically malnourished because of a diet made of 80% ultraprocessed food. Maybe you have chronic anxiety and panic disorder. There are a million reasons why your subconscious mind could be reading your life as unsafe for baby-making - which raises an obvious question - what about women whose lives look objectively unsafe and whose fertility seems completely unphased?
The women who are actually unsafe but who keep making babies.
You might know someone like I do - someone with tons of childhood trauma, watching her parents fight, break up, get back together, hit each other, and use drugs, on repeat. She’s been with an abusive partner since she was 17. They’ve made four babies together, through the kind of high-conflict, on-again, off-again chaos that should, by every argument I just made, be suppressing her fertility into the ground. It hasn’t.
The body’s whole reproductive shutdown depends on one thing: whether the environment is read by the autonomic nervous system as unsafe. I’ve been writing this whole piece as if that evaluation is objective, as if a body just automatically knows real danger when it sees it. It doesn’t. It’s calibrated, and it’s calibrated early, mostly by whoever raised you.
When a child’s parent is also her source of fear, and this happens over and over before age eight, the nervous system runs into a conundrum: stay close to survive, but closeness is where the danger lives. Researchers call the result disorganized attachment. This is what a nervous system does when love and danger seem joined at the hip in the same person, in the same house, for years.
There’s actual experimental evidence for what this does downstream. A large fear-conditioning study measuring biometric signals of stress found that adults with childhood adversity show a blunted ability to physiologically discriminate between danger cues and safety cues. Their alarm system doesn’t fire the same way at the same things. Their threat-detection software got confused early and stayed there.
And it runs both directions.
Chaos doesn’t just fail to register as dangerous, calm registers as dangerous instead. Quiet and predictable can feel like the held breath before the next blowup, the same way it did with alcoholic Dad in childhood. Some people provoke (or attract) conflict without knowing why, because conflict is at least a known, survivable state, and peace is unfamiliar territory with no map.
“Unsafe” is in the eye of the beholder
The flip side of the traumatized Fertile Myrtle is what so many of my clients look like: they’re privileged, professional women - like I was - with no obvious (even to themselves) reasons to feel unsafe. Their high-functioning cerebral cortex, though, isn’t driving the bus. The amygdala is. Brain stem. Lizard brain. And usually, I just have to dig a little bit with my clients: “what about your life might be registering to your unconscious brain as incompatible with the vulnerability and dependence of pregnancy and childbearing?”
They often know. The tears usually spring up quickly.
They know where their deepest fears and vulnerabilities are hiding. They know their marriage is crushing their soul. Their career and their professional identities are making them feel trapped or victimized. Their money problems feel insurmountable. Not being able to buy a home they feel happy in, stuck in a rental they despise. Their Instagram feed as a source of tribal rejection or constant pick-me-ism, hour after inadequate hour.
What is the thing - that thing you know in your heart is the answer to my question about what makes you feel unsafe - costing you? Are you willing to let it cost you the baby you’re desperate to have?
What about the grizzly bear that’s so familiar we don’t even notice it consciously anymore?
And if you’re being honest, what if there’s actually no grizzly left at all, but your subconscious mind is still causing your body to brace for one anyway? What’s the old threat-detection program running long after its usefulness has expired?
Are you so afraid to rock the boat that you’d sacrifice your chance to rock your baby?
Inertia is incredibly powerful. But I’ve also discovered, working with women, that there’s no status quo powerful enough to thwart a woman who wants a baby more than life.
Infertility is a screaming red siren from your biology and your deepest, most primal self. I ignored its signs until it was too late. Don’t be me.
If you know what is behind the safety signal, you probably have a million stories about why you can’t change it. Why you’re trapped. Why there’s no hope. Why escape is impractical, irresponsible, selfish, reckless.
It’s ok to choose the bear. Many women quietly sacrifice their bodies (and their deepest needs) to the bear every day.
There are no easy answers.
This isn’t that kind of article. No five-step plan, no call-to-action, no “link in bio.”
Just the question I opened with, and only you know the answer. If you’re struggling to get pregnant, your body may already be answering for you.
A mother will do anything to keep her baby safe. And a mother’s subconscious safety patrol starts before conception - by scanning her own internal and external environment - and prioritizing her immediate survival, so she lives to mother another day. But if we don’t slay the dragons shutting down our fertility now, that future day may never come.
Are you so attached to the grizzlies in your path that you’d give up a chance for a baby?