Miscarriage After 35: When “Bad Luck” Isn’t the Whole Conversation

October is Pregnancy and Infant Loss Awareness Month.

If you've experienced a miscarriage, you may have been told some version of:

“Unfortunately, these things happen.”

“It was probably bad luck.”

Or, if you're over 35:

“It was most likely your age.”

There is medical truth behind some of those statements.

Early miscarriage is common. Chromosomal abnormalities in the embryo cause a large percentage of first-trimester losses, and the likelihood of those abnormalities increases with maternal age.

But “bad luck” is a description of probability. It is not a complete review of your individual pregnancy, health or fertility history.

And I think women deserve to understand the difference.

After one miscarriage, you may not need an extensive recurrent-pregnancy-loss workup.

You also don't need to pretend the loss tells us nothing.

The better question is:

What can reasonably be learned now—and what should change the conversation if it happens again?

What Does “Bad Luck” Usually Mean After a Miscarriage?

Most of the time, your doctor isn't trying to dismiss you.

They're trying to explain something that is unfortunately true:

Many miscarriages happen because an embryo develops with a chromosome abnormality that prevents the pregnancy from continuing.

The American Society for Reproductive Medicine estimates that approximately 50–60% of first-trimester miscarriages are caused by embryonic aneuploidy, meaning the embryo had an abnormal number of chromosomes.

Age affects that probability.

The chance of a chromosomally abnormal embryo increases as eggs age, which is one reason miscarriage becomes more common after 35.

So after one early miscarriage, it can be completely reasonable for your physician to say:

“This may have been a random chromosome error.”

What is different is saying:

“Therefore, there is nothing else worth reviewing.”

Those are not the same conclusion.

Age Changes Risk. It Doesn't Tell Us What Happened in Your Pregnancy.

This distinction matters enormously.

If your pregnancy tissue was never genetically tested, we usually cannot say with certainty that a chromosome abnormality caused that particular miscarriage.

It may have.

Statistically, age makes that increasingly plausible.

But probability is not the same thing as diagnosis.

This is one reason I don't like either extreme:

“It was definitely your age.”

“Age had nothing to do with it.”

Neither is particularly useful.

A better conversation is:

“Age increases the chance that this loss was chromosomal. What information do we actually have about this pregnancy, and does anything else in your history change what we should do next?”

That gives us somewhere to go.

After One Miscarriage, You Usually Don't Need to Test Everything

This is important.

Experiencing a miscarriage can create an understandable urgency to find a reason before you ever risk becoming pregnant again.

And the internet will give you an enormous list:

Immune testing
Clotting panels
Hormone panels
Genetic testing
Endometrial testing
Microbiome testing
Sperm DNA fragmentation
Nutrient testing
Inflammation markers

That does not mean all of those tests are appropriate after one early loss.

Current guidance does not recommend automatically launching a complete recurrent-pregnancy-loss workup after one uncomplicated early miscarriage.

Broad inherited-clotting testing, immune panels and many specialty fertility tests are also not recommended routinely just because a miscarriage occurred.

But here is the nuance:

“You don't need a recurrent-loss workup” does not mean “there is nothing to review.”

That is the part I think women often miss.

The Three Things I Separate With My Clients After a Miscarriage

When a woman comes to me after a loss, I don't start with:

“What tests haven't you ordered yet?”

I separate the situation into three buckets.

1. What do we know about this pregnancy?

2. What does her existing history tell us?

3. What should be addressed for her health before another pregnancy?

Those three questions are very different from simply ordering more fertility tests.

And they often uncover exactly where the next conversation belongs.

1. What Do We Actually Know About This Pregnancy?

Start with the pregnancy itself.

Ask:

How far along were you?
Was an intrauterine pregnancy confirmed?
Was cardiac activity ever seen?
Were there ultrasound abnormalities?
Was there significant bleeding?
Was a subchorionic hematoma present?
Was pregnancy tissue available?
Was chromosome testing performed?
Was pathology performed?
Was the miscarriage medically complete?
Was follow-up ultrasound or hCG monitoring recommended?

You may not have an answer to every one of those questions.

That's okay.

The point is to distinguish:

what is known

from

what everyone is assuming.

If tissue was genetically tested and showed aneuploidy, that gives you meaningful information about that loss.

If it was not tested, you may simply not know.

And sometimes accepting “we don't know” is actually more accurate than turning probability into certainty.

2. Is This Truly an Isolated Loss—or Part of a Larger Fertility History?

A first miscarriage in someone who conceived quickly, has no significant symptoms and has no previous fertility problems is different from a first documented miscarriage in someone who has already spent three years trying to conceive.

I want to know the full story.

For example:

How long did it take you to conceive?
Have you had previous biochemical pregnancies?
Have there been earlier losses you didn't initially count as miscarriages?
Have you undergone fertility treatment?
Have embryo transfers failed?
Do you have known endometriosis?
Fibroids?
Irregular cycles?
Significant pelvic pain?
Thyroid disease?
Diabetes or insulin resistance?
Previous uterine surgery?
A personal history of blood clots?
Significant male-factor findings?

A miscarriage doesn't occur in isolation from the rest of your reproductive history.

And sometimes the phrase “first miscarriage” doesn't adequately describe the fertility journey that came before it.

Two Losses Changes the Conversation

This is particularly important in 2026 because the definition of recurrent pregnancy loss has become clearer.

ASRM now defines recurrent pregnancy loss as two or more pregnancy losses, and pregnancies confirmed by blood or urine hCG can count toward that definition.

So if you've experienced two losses, including a very early biochemical pregnancy, your conversation should be different from:

“This is just bad luck. Try again.”

That doesn't mean you need every specialty test available.

It means you've crossed into a situation where a structured recurrent-loss evaluation becomes appropriate.

I covered that distinction in detail here:

One Miscarriage vs. Recurrent Loss: When Should Testing Start?

And if you've already experienced recurrent loss after 35, read:

Recurrent Miscarriage After 35: When Is It Time to Look Deeper?

3. Has Anyone Reviewed Your Health Before the Next Pregnancy?

This is where I think a large gap exists.

Your doctor can appropriately decide that you do not need recurrent-loss testing after one miscarriage.

That does not mean your general health should disappear from the conversation.

Pregnancy places significant demands on the body.

Before trying again, I want a woman to know:

When was your last physical?

When was your last well-woman visit?

When did somebody last review your basic bloodwork?

Does the person managing any chronic condition know you're trying to conceive?

If it has been more than a year since your routine preventive or well-woman care was updated, I would start there.

Depending on your history, symptoms and previous results, your primary-care physician or OB/GYN may decide it makes sense to review things such as:

CBC
Ferritin and iron status
Thyroid function
Vitamin D
B12 or folate
Blood sugar or A1c
Medications and supplements
Prenatal vitamin adequacy
Diet and nutritional status

I am not saying that a low ferritin, vitamin D or B12 result caused your miscarriage.

I'm not saying every woman needs every one of those tests.

And I'm not suggesting we need to push every laboratory value into an arbitrary “fertility optimal” range.

I'm saying:

An actual deficiency or poorly managed health condition still deserves attention before pregnancy—even if it isn't proven to be the reason the pregnancy ended.

That is a very different claim.

Significant Bleeding Is One Example of Why the Bigger Health Picture Matters

Suppose your miscarriage involved substantial blood loss.

Your recurrent-loss evaluation may not change at all.

But your general health may have changed.

If you already had low iron stores—or you experienced significant bleeding—it may be reasonable to ask your physician whether your CBC and iron status deserve reassessment before another pregnancy.

That isn't a test to find “the cause of the miscarriage.”

It is a health question created by what your body just went through.

This distinction matters.

Not every useful test is a miscarriage test.

Known Thyroid Disease Is Another Example

If you already have hypothyroidism or another thyroid disorder, I don't want the only conversation to be:

“Could thyroid have caused the miscarriage?”

I want to know whether the condition is appropriately managed before another pregnancy.

That means asking questions such as:

When was TSH last checked?
Has your medication changed?
Does the clinician managing your thyroid know you're trying again?
Does your treatment plan account for pregnancy?

The goal isn't to blame thyroid for the loss.

The goal is to make sure a real medical condition isn't neglected while everyone debates why the miscarriage occurred.

When Should “Bad Luck” Stop Being Enough?

There isn't one universal point.

But I would ask for a more detailed conversation when:

You have experienced two or more pregnancy losses
You've been trying to conceive for a prolonged period
You have significant pelvic pain or suspected endometriosis
You have a known uterine abnormality or fibroids
You've had previous uterine surgery or procedures
You have a personal history of thrombosis
You have a known autoimmune or endocrine condition
You have irregular cycles
You're experiencing repeated failed fertility treatment
There are significant male-factor concerns
The pregnancy loss occurred later or had unusual clinical features
You are over 35 and time is becoming an important treatment consideration

None of those automatically identifies the cause.

They tell us:

Your history deserves to drive the next question.

What I Would Not Do After One Miscarriage

I would not assume something terrible has been missed.

I would not automatically order every immune or clotting test.

I would not assume your body “rejected” the pregnancy.

I would not diagnose progesterone deficiency based on a single low level during a failing pregnancy.

I would not tell you that one nutrient deficiency explains your miscarriage.

And I would not promise that if you optimize enough things, another miscarriage becomes impossible.

That isn't honest.

What I Would Do

I would make sure:

The miscarriage was medically resolved
You understand what was—and was not—learned from the pregnancy
Your complete reproductive history has been considered
Your routine and preconception health care are current
Known medical conditions are appropriately managed
Your medications and supplements are pregnancy-appropriate
You understand when your history would warrant additional evaluation
You know what questions you would ask if another loss occurred
You and your provider have discussed when it is reasonable for you to try again

That is not over-testing.

That is preparation.

“Bad Luck” Shouldn't Mean “Do Nothing”

This may be the biggest point I want women to take from this article.

Sometimes a miscarriage truly is a sporadic event that we could not have predicted or prevented.

You can accept that possibility without abandoning thoughtful preconception care.

You don't need to find something wrong with yourself to justify taking care of yourself.

You don't need a recurrent-loss diagnosis before asking whether your thyroid condition is managed.

You don't need proof that iron deficiency caused your miscarriage before correcting iron deficiency.

And you don't need a giant specialty-testing panel to make sure your medical history has actually been reviewed.

Those are separate conversations.

And “Bad Luck” Shouldn't Mean “It's Your Fault”

The phrase can create another problem.

Women hear:

“Something random happened.”

And somehow translate it into:

“Maybe if I had eaten differently, stressed less, exercised differently, taken another supplement or found the right doctor sooner, this wouldn't have happened.”

That is not what the evidence tells us.

Most early chromosomal miscarriages are not something you created through an ordinary choice you made.

There is a difference between:

supporting your health before pregnancy

and

believing you can control every pregnancy outcome if you optimize hard enough.

You can't.

And no fertility coach, supplement protocol or physician can honestly promise otherwise.

What If You're Afraid to Try Again?

This is also part of the conversation.

Being medically cleared to conceive again doesn't necessarily mean you feel emotionally ready.

Some women want to try again immediately.

Others need more time.

Neither response means you're handling the loss incorrectly.

ACOG notes that ovulation can return quickly after an early miscarriage, so pregnancy can occur again before you even have another menstrual period.

That makes contraception—or intentionally trying again—something worth discussing rather than leaving to chance.

Your OB/GYN can help you decide when it is medically reasonable to resume trying based on your individual situation.

And you are allowed to consider your emotional readiness too.

The Question I Would Ask Before Trying Again

Not:

“How do I make sure this can never happen again?”

We can't answer that honestly.

I would ask:

“Is there anything from this pregnancy, my history or my current health that should reasonably change what I do before the next one?”

Sometimes the answer is yes.

Sometimes it is no.

Sometimes the answer is:

“We don't know why this happened, but your evaluation is appropriate and trying again is reasonable.”

That can be clarity too.

If You're Still Unsure What Deserves Your Attention

Miscarriage can leave you with dozens of records, lab results and questions—and no idea which ones actually matter.

That's the kind of situation we can begin sorting through on a free 20-minute Hope & Clarity Call.

We'll talk about where you are now, what you've already been told, what still feels unresolved and whether there is an obvious next question worth bringing back to your medical team.

No promise that something hidden caused your loss.

No automatic recommendation for more testing.

Just a clearer picture of what deserves your attention next.

Book Your Free Hope & Clarity Call

Quick Answers

Is miscarriage after 35 usually caused by age?

Age increases miscarriage risk largely because chromosomal abnormalities in embryos become more common as eggs age. But age alone cannot prove why an individual pregnancy ended unless additional information—such as genetic testing of miscarriage tissue—is available.

Is one miscarriage considered recurrent pregnancy loss?

No. Current ASRM guidance defines recurrent pregnancy loss as two or more pregnancy losses.

Should I have testing after one miscarriage?

An extensive recurrent-loss workup generally isn't recommended automatically after one uncomplicated early miscarriage.

However, your medical history, fertility history, symptoms and features of the pregnancy can create reasons for specific follow-up. Routine preconception health care is also still appropriate.

Should miscarriage tissue be genetically tested after one loss?

Chromosome testing can sometimes be offered for explanatory purposes after a first miscarriage, but ASRM specifically recommends offering it after a second miscarriage or in recurrent pregnancy loss when tissue is available.

Does “bad luck” mean nothing else should be checked?

No.

It may mean there is no evidence yet that you need an extensive recurrent-loss evaluation.

Your recovery, existing medical conditions, fertility history, routine preventive care, nutrition, medications and preconception health can still deserve attention.

Should I check CBC, ferritin, thyroid, vitamin D or B12 after miscarriage?

Not every woman needs the same laboratory panel.

If it has been more than a year since your preventive or well-woman care was updated, start there.

Your clinician can determine whether CBC, iron/ferritin, thyroid, vitamin D, B12, metabolic testing or other labs make sense based on your health history, symptoms, diet, previous deficiencies and the circumstances of your miscarriage.

If your miscarriage involved significant blood loss, for example, reassessing CBC and iron status may be a reasonable health question even though it is not a test designed to explain why the miscarriage occurred.

When should miscarriage testing become more extensive?

Two or more losses meet the current ASRM definition of recurrent pregnancy loss and warrant a more structured evaluation.

Certain medical histories or unusual features of a loss can also justify earlier targeted investigation.

Can I get pregnant quickly after miscarriage?

Yes. Ovulation can return within weeks after an early miscarriage. Talk with your OB/GYN about when it is medically appropriate for you to try again and consider your emotional readiness as well.

Sources

American Society for Reproductive Medicine. Recurrent Pregnancy Loss: A Committee Opinion. 2026.

American College of Obstetricians and Gynecologists. Early Pregnancy Loss.

American College of Obstetricians and Gynecologists. Repeated Miscarriages.

American College of Obstetricians and Gynecologists and American Society for Reproductive Medicine. Prepregnancy Counseling.

Created by Erica

About the author and editorial review

Written and personally reviewed by Erica Hoke, Certified Naturopathic Coach and founder of Infertility Empowered. This article has been reviewed for clarity, source accuracy and alignment with current fertility guidance. It is educational and is not a substitute for individualized medical advice, diagnosis or treatment.

Last reviewed: October 16, 2026