Why You’re Not Getting Pregnant Despite Trying Everything: An Expert Look at Unexplained Infertility

UPDATED ON 24TH JAN. 2026

Query Asked: (5-Year Journey with Unexplained Infertility and Failed IVF)

I am a 32-year-old woman, and my husband and I have been married for five years. Despite our deepest desire to become parents, we have not yet been able to conceive.

We feel stuck because, medically, we both appear to be ‘normal.’ I have no thyroid issues, my fallopian tubes are open (confirmed via HSG), and my husband’s reports are normal.

We have tried everything within our power. We started with basic treatments, moved on to IUI procedures, and eventually tried IVF twice—but sadly, both cycles failed.

I am emotionally exhausted and just want to know: What do we do now? How do we overcome this unexplained infertility so I can finally become a mother?”

Dr. Jay Mehta Explains: Why IVF Can Fail Despite Normal Reports

If you and your partner have ticked every box—standard tests are normal, thyroid is balanced, tubes are open, and even IVF cycles have been attempted—yet you are still not parents, you are likely dealing with Recurrent Implantation Failure (RIF) or a deeper, undiagnosed pathology often labelled as “Unexplained Infertility”.

In my experience, “unexplained” simply means the standard tests were not sensitive enough to find the root cause.

When a 32-year-old female with a 5-year history of infertility fails two IVF cycles despite “normal” reports, the cause is rarely bad luck.

It is usually hidden in the genetics of the embryo, the molecular receptivity of the lining (endometrium), or the microscopic integrity of the sperm DNA.

If you’ve reached this stage—failed IUIs, failed IVF, and no clear answers—this is the exact point where a structured second opinion matters.

I personally review such cases in detail at Shree IVF Clinic, Mumbai, looking beyond routine reports to identify the one missing diagnosis that is blocking implantation.

You can book a focused Failed IVF / Unexplained Infertility consultation with Dr. Jay Mehta , fertility & reproductive medicine specialist in Mumbai, India to get a clear to understand why pregnancy hasn’t happened yet and what needs to change before your next step.

Sometimes, the difference between failure and success is not effort—but the right diagnosis at the right time.

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Quick Summary: Why Pregnancy Hasn’t Happened Yet?

• The “Normal” Trap: Standard semen analysis and HSG tests only scratch the surface. They do not reveal molecular or genetic defects.

• Sperm DNA Fragmentation: You may have a high sperm count, but if the DNA inside the sperm head is damaged (DFI > 30%), it can lead to embryo arrest or implantation failure.

• Genetic Aneuploidy: Even “good-looking” embryos under a microscope can be chromosomally abnormal. Without Preimplantation Genetic Testing (PGT-A), you are flying blind.

• Silent Uterine Pathology: Conditions like subtle Adenomyosis or Chronic Endometritis often go undetected on standard 2D ultrasounds but create a hostile environment for implantation.

• Implantation Window: The uterus is only receptive for a specific number of hours. If your embryo transfer isn’t timed to this window, even the best embryo will fail.

Does ‘Unexplained Infertility’ Really Mean Unknown Causes?

In my 13 years of clinical practice at Shree IVF Clinic in Mumbai, I have sat across from hundreds of men in your exact position. 

You are frustrated, your wife is emotionally exhausted, and you have files full of reports that say “everything is normal”.

But here is the hard truth I tell my patients: “Normal” is a relative term.

A standard semen analysis tells me if your sperm can swim. It does not tell me if the genetic payload inside is intact. 

An HSG tells me the tubes are open (patent), but it doesn’t tell me if the uterine lining is inflamed at a cellular level. 

When you have failed IUI and IVF cycles, we must stop looking at the “macro” picture and start looking at the “micro” and “molecular” levels.

We are moving away from the era of “standard” IVF into the era of Precision Medicine. 

If you are asking, “What do we do now?”, the answer lies in advanced diagnostics that dig deeper than the routine checks you have already done.

The Male Factor: Are We Ignoring Sperm DNA Fragmentation?

Gentlemen, this is where we need to have a serious conversation. 

Often, when a couple fails IVF, the focus immediately shifts to the woman—her eggs, her uterus, her hormones. 

But in many cases of “unexplained” infertility or recurrent IVF failure, the issue lies with the man.

You might have been told your sperm count and motility are fine. 

But standard analysis does not measure Sperm DNA Fragmentation Index (DFI).

What is Sperm DNA Fragmentation Index ie. DFI?

Think of the sperm as a courier delivering a package (DNA) to the egg. 

A standard test checks if the courier helps the van move (motility) and if the van looks new (morphology). DFI checks if the package inside is broken.

If your sperm DNA fragmentation is high, specifically if DFI > 30%, the sperm can still fertilise an egg, but the resulting embryo often stops developing after Day 3 or fails to implant.

High DFI is caused by:

• Oxidative stress (pollution, smoking, lifestyle).
• Varicocele (swollen veins in the scrotum).
• Advanced paternal age (though at 32-45, lifestyle is a bigger factor).

At our Mumbai clinic, we routinely perform DFI testing for couples with failed IVF cycles. If the level is high (>30%), we do not just proceed with standard ICSI.

We use advanced sperm selection techniques like MACS (Magnetic Activated Cell Sorting) or Microfluidics to filter out damaged sperm before fertilization.

Why Did “Good” Embryos Fail to Implant? (The Role of Genetics)

You mentioned your wife is 32. At this age, biology is generally on her side, but not always. One of the biggest misconceptions is that if an embryo “looks” good under a microscope (morphologically normal), it is genetically normal.

This is false.

An embryo is graded based on its expansion and cell mass (e.g., 4AA or 3BB). However, a top-quality 4AA embryo can still be aneuploid, meaning it has the wrong number of chromosomes (missing or extra DNA).

The Mathematics of Aneuploidy

At age 32, approximately 30% – 40% of a woman’s eggs will generate aneuploid embryos naturally. P(Aneuploidy) approx 0.35 at age 32 

If you transfer an aneuploid embryo, one of three things happens:

1. It fails to implant (Negative Beta hCG).
2. It implants but results in a biochemical pregnancy (early loss).
3. It results in a clinical miscarriage.

The Solution: For couples with repeated failures, we recommend PGT-A  (Preimplantation Genetic Testing for Aneuploidy). 

We take a small biopsy from the Day 5 embryo (blastocyst) and analyse its chromosomal makeup. 

We only transfer embryos that are Euploid (chromosomally normal). 

This drastically reduces the “trial and error” approach and increases success rates per transfer to over 60-70%.

Clinical Insight: The Case of “Perfect” Fertility Reports Yet No Pregnancy

I recently saw a couple from Bandra, similar to this profile. 

The wife was 31, husband 34. Two failed IVFs elsewhere. 

On paper, they were “perfect.” However, when we ran PGT-A on their next batch of 5 blastocysts, 3 were aneuploid. 

If we hadn’t tested, we would have likely transferred those 3 abnormal embryos one by one, leading to 3 more months of heartbreak and failure. 

By transferring the single Euploid embryo, they achieved a pregnancy in the first attempt with us.

The “Silent” Uterine Killers: Adenomyosis and Endometritis

This query says the wife has “no history of thyroid” and “tubes are open.” But has she been screened for Adenomyosis or Chronic Endometritis?

Adenomyosis

This is a condition where the inner lining of the uterus (endometrium) breaks through the muscle wall (myometrium).

It causes the uterus to become bulky and inflamed. It is notoriously difficult to diagnose on a quick 2D ultrasound. It acts like a natural contraceptive device, preventing implantation.

If the Junctional Zone (the border between lining and muscle) is thickened (JZ > 12  mm), implantation rates drop significantly.

Chronic Endometritis

This is a low-grade, symptomless infection of the uterine lining. It is not the same as endometriosis. It is caused by bacteria and leads to an immune response that attacks the embryo.

We diagnose this using CD-138 Immunohistochemistry markers on an endometrial biopsy.

If positive (>5  plasma cells/HPF), a simple course of targeted antibiotics can cure it and restore fertility.

Are We Missing the Implantation Window? ERA Test Explained by a Fertility Specialist

The uterus is not always ready to accept an embryo.

There is a specific window of time, usually around 120 hours after progesterone exposure begins, where the endometrium is “receptive”. This is called the Window of Implantation (WOI).

For about 15-20% of women with Recurrent Implantation Failure, this window is displaced. It might open 12 hours earlier or 24 hours later.

If we transfer a Day 5 embryo into a uterus that is “Pre-receptive” (needs more progesterone) or “Post-receptive” (window closed), the cycle will fail, no matter how good the embryo is.

The Solution:

We perform an ERA (Endometrial Receptivity Array) test. We perform a “mock cycle,” take a biopsy of the lining at the standard transfer time, and analyse the genetic expression of 238 genes involved in receptivity. This tells us the exact hour to perform the transfer.

Clinical Insight: Timing Is Everything in Implantation Success

A patient came to me after 4 failed transfers. She was devastated. We ran an ERA test and found her window was “Pre-receptive” by 24 hours.

Essentially, her previous doctors were putting the embryo in a day too early, every single time. We adjusted the progesterone timing by exactly 24 hours in the next cycle. She is now a mother to twins.

Immunological Factors: Is Her Body Rejecting Pregnancy?

In some rare cases, the female immune system is overactive. It perceives the embryo (which contains 50% of your DNA, essentially a “foreign” object) as a threat, similar to a virus or bacteria.

Natural Killer (NK) cells are part of our defence system. However, if the concentration of uNK (Uterine Natural Killer) cells is too high, they can attack the trophoblast cells of the embryo, preventing it from burrowing into the lining.

 Abnormal uNK Levels > 5%  (CD56+ cells) 

At Shree IVF Clinic, for patients with multiple unexplained failures, we evaluate immunological markers.

Treatments like Intralipids or low-dose steroids can suppress this overactive immune response, allowing the pregnancy to thrive.

What Should You Do Next to Move Forward?

You asked, “What to do now?” Here is my strategic advice for a male partner looking to take control of this situation.

• Stop “Trying” Blindly:

Do not rush into a third IVF cycle with the same protocol. Insanity is doing the same thing and expecting different results.

• Advanced Evaluation:
• • For You: Get a sperm DNA fragmentation test.
  • For Her: Consider a hysteroscopy (camera inside the uterus) to rule out chronic endometritis and check for silent adenomyosis.
  • For the Embryos: If you do another IVF cycle, insist on Blastocyst Culture (Day 5 transfer) and consider PGT-A to ensure genetic normalcy.

• Lifestyle Audit:

If your BMI is >30 kg/m^2 or if you smoke, you are actively reducing your success rates by 50%. We must optimize your metabolic health before we optimize the sperm.

Why Choose a Shree IVF Clinic for Complex Cases?

In Mumbai, India, there are many IVF centres. But Shree IVF Clinic is where patients come when standard treatments have failed. We specialize in failed IVF and complex infertility.

We don’t just follow a standard protocol. We use:

• Laser-Assisted Hatching: To help the embryo break out of its shell.
• Artificial Intelligence in Embryo Selection: Using time-lapse imaging to pick the embryo with the highest potential.
• Immunomodulation Therapy: For cases of immune rejection.

Your journey has been long and painful, but it is not over. The fact that your wife is 32 means she has a high ovarian reserve and good egg quality potential. The fact that you are seeking answers means you are ready to tackle the difficult questions.

We often see that the difference between “failure” and “family” is just one missing diagnosis.

Conclusion: It’s Not Game Over—There Are Still Options

To the husband reading this: Do not lose hope. The feeling of hitting a wall after failed IVF is crushing, but medically, it provides us with data. We now know what doesn’t work.

At Shree IVF Clinic, we view unexplained infertility not as a dead end, but as a puzzle waiting for the right tool. Whether it is correcting DNA fragmentation, timing the transfer to the precise hour, or selecting a genetically normal embryo, the technology exists to overcome these hurdles.

You deserve to stop guessing and start understanding.

AUTHOR

CONDITION

Infertility

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