Why Does IVF Keep Failing? Here's What Nobody Is Actually Checking

I've worked with thousands of women who've been through multiple IVF cycles. Smart, informed women who did everything right — found the best RE, took all the supplements their doctor suggested, reduced stress, ate well. And it still didn't work.

When I sit down with these women, the first thing I ask is: what did your monitoring show between cycles? What did your sleep look like? Your glucose? Your HRV? Almost universally, the answer is the same: nobody checked.

"Here's what's actually happening in most failed IVF cycles: the clinical team is optimizing the protocol — but nobody is optimizing the underlying biology that determines whether that embryo implants and stays."

Those are two completely different problems.

The Five Things That Determine Whether IVF Works

After 25 years and 10,000+ credited pregnancies, I've identified five underlying biological issues that show up in almost every case of unexplained infertility and recurrent IVF failure. They're not exotic. They're not rare. And standard IVF monitoring misses all of them.

1. Poor blood quality and circulation. Your uterine lining needs consistent, oxygen-rich blood flow to support implantation. Subclinical circulation issues — things that won't show up on a standard blood panel — can make implantation nearly impossible regardless of embryo quality.

2. Subclinical inflammation. Low-grade systemic inflammation is one of the most underdiagnosed factors in recurrent implantation failure. It doesn't feel like anything. Your bloodwork looks fine. But it creates a hostile uterine environment at exactly the moment you need it to be receptive.

3. Blood sugar dysregulation. You don't have to be diabetic for blood sugar swings to affect your fertility. Even moderate glucose volatility disrupts hormonal signaling, affects egg quality, and impairs the implantation window. Most REs never check this.

4. Progesterone insufficiency. Getting pregnant and staying pregnant are two different problems. Progesterone is what keeps an early pregnancy viable. Subclinical progesterone insufficiency is remarkably common — and it's rarely caught on standard cycle day 21 testing because timing is everything.

5. Stress-driven HPA axis disruption. Chronic stress doesn't just make you feel bad. It dysregulates the hormonal axis that governs your entire reproductive system. The IVF process itself is one of the most stressful things a person can go through — and that stress is actively working against the outcome you're trying to achieve.

Why "Everything Looks Normal" Is Keeping You Stuck

Standard IVF monitoring is excellent at what it does: tracking follicle development, measuring hormone levels at specific protocol points, grading embryo quality. I have enormous respect for reproductive endocrinologists — they're doing technically complex work.

But the monitoring happens in snapshots. A blood draw on day 3. An ultrasound on day 8. An HCG check post-transfer. What nobody is capturing is your continuous biology — what your body is doing at 2am, what your glucose looks like after meals, how your stress response is affecting your HRV day over day.

"Normal isn't optimal. A test result that falls within the reference range doesn't mean your biology is optimized for pregnancy. It means you don't have a diagnosable disease."

What Continuous Monitoring Actually Shows

This is why we built the Halo Ring into the Conceivable system. The Halo monitors basal body temperature, heart rate variability, glucose, and sleep continuously — not in snapshots, but around the clock. When I look at a woman's Halo data over 60 or 90 days, I can see things that a clinic visit will never catch.

I can see that her BBT pattern suggests her luteal phase is shorter than her cycle apps indicate. I can see glucose spikes at 11pm that are disrupting her sleep architecture and driving cortisol the next morning. I can see HRV patterns that tell me her nervous system is in chronic stress response even on days she reports feeling fine.

This data feeds into Kai, our AI coordinator, which synthesizes patterns across all four data streams and flags what needs attention. Your Conceivable system — personalized supplements, Halo Ring, Kai — then works on those specific issues continuously, not just during a cycle.

What to Do Before Your Next Cycle

If you're planning another IVF cycle — or if you're trying naturally and not getting results — the most important thing you can do is not just optimize your protocol. Optimize your biology first.

The women who did best weren't the ones who found the most aggressive protocol — they were the ones who showed up to their next cycle with fundamentally healthier biology. Your doctor isn't testing for these things. That doesn't mean they don't matter. It means you need a system that does.

Frequently Asked Questions

How many failed IVF cycles is normal before something is investigated?

Most clinics define recurrent implantation failure as two or more failed transfers with good-quality embryos. At that point, a deeper investigation is warranted — but "deeper investigation" in standard care usually means more cycle monitoring, not evaluation of the subclinical biological factors I'm describing here. If you've had two failed transfers, don't wait for a third before asking harder questions about your underlying biology.

Can you improve IVF success rates without changing the protocol?

Yes — and this is exactly the point. Your RE controls the protocol. You control the biological environment that protocol is working in. Improving blood quality, reducing inflammation, stabilizing blood sugar, and supporting progesterone production are all things you can actively work on between cycles. In many cases, the protocol doesn't need to change — the biology does.

What tests should I ask for after a failed IVF cycle?

Beyond what your RE typically orders, worth discussing: sperm DNA fragmentation if embryo quality was poor, a uterine receptivity assessment (ERA test), natural killer cell testing if immune implantation failure is suspected, and a thorough look at progesterone timing during the luteal phase. Your RE may or may not agree these are indicated — but they're worth the conversation.

Does stress actually affect IVF outcomes?

Yes, through a specific physiological mechanism — not just "stress is bad." Chronic stress elevates cortisol, which competes with progesterone for receptor binding and suppresses GnRH pulsatility, disrupting the hormonal signaling that governs the entire reproductive cycle. The IVF process itself generates significant stress load. Addressing HPA axis dysregulation isn't soft advice — it's clinical intervention.

Is it worth trying natural conception optimization before another IVF cycle?

For most women who've had one or two failed cycles, yes — especially if the 90-day window doesn't delay a cycle you urgently need. Entering a cycle with better egg quality, better uterine receptivity, and lower systemic inflammation improves the odds of the protocol working. It's not either/or. It's preparation.

How does the Conceivable system actually work?

Conceivable combines three things: personalized supplement packs built from your quiz results and health data, an AI care team of 7 specialists (led by Kai, your fertility coordinator) who adjust your protocol as your body changes, and the Halo Ring for continuous biometric tracking. The system is built on 240,000+ clinical data points and 20 years of practice. It starts at $15/month.

How do I know which supplements I actually need?

Take the free 2-minute Conceivable quiz. It analyzes your cycle patterns, energy, stress, digestion, and health history to identify the specific nutrients your body needs — not a generic prenatal, but a protocol built for exactly where you are right now.

Do I need the Halo Ring to use Conceivable?

No. The Halo Ring is optional and adds continuous tracking of BBT, HRV, sleep, and blood glucose — which Kai uses to fine-tune your protocol in real time. But the personalized supplement packs and AI care team work without it. The ring is a one-time $250 purchase with no subscription required.

Written by Kirsten Karchmer, reproductive medicine practitioner with 25 years of clinical experience and 10,000+ credited pregnancies, and author of The Road to Better Fertility.