Why Do I Keep Miscarrying When Tests Are Normal?
Recurrent miscarriage is utterly devastating, particularly because if you're facing recurrent pregnancy loss you feel like a failure, ashamed, misunderstood, and so much more. On top of the grief.
I hear you! And it's natural to get to the bottom of 'Why do I keep miscarrying when tests are normal?
But before we get into that, I want you to know that this is not your fault. I'll explain why, but please, if you get nothing else from this article, know that.
What does recurrent miscarriage mean?
So, just to get our language straight before we go any further, recurrent miscarriage simply means having had more than one miscarriage.
You may also hear it called recurrent pregnancy loss, and depending on where you are or who you're speaking to, the exact definition used can differ slightly.
Some people arrive at this point after multiple miscarriages very close together. For others, there may have been successful pregnancies in between. Some losses happen very early, others later.
So when I'm talking about repeated miscarriages or recurrent pregnancy loss through the rest of this article, I'm talking about that wider picture of pregnancy happening, but not continuing as you hoped.
That's really all we need from the recurrent miscarriage definition for now.
Because it's more useful to understand what's sitting underneath that pattern, what has already been investigated, and what may still deserve a closer look.
Multiple Miscarriages
Each instance of loss not only brings emotional turmoil but also prompts a search for answers, especially when medical tests return normal results. Many women find themselves asking, "Why do I keep miscarrying when tests are normal?"
This reflects your deep longing for understanding amid the pain of repeated miscarriages.
Recurrent Miscarriage Tests
While the medical community has made significant strides in identifying the causes of miscarriage, many women still face unexplained infertility or recurrent miscarriage without clear reasons.
Our exploration will delve into the complexities of recurrent pregnancy loss, examining potential causes and considerations for those navigating this challenging journey. By concentrating on the specific search intent related to normal test results and miscarriage, I'll provide insightful, actionable information that resonates with women seeking clarity and hope.
Why do I keep miscarrying?
It would be negligent of me to answer “why do I keep miscarrying?” with one simple explanation that ignores the nuances of our individual biological makeup.
But broadly speaking, when we ask why miscarriages keep happening, we’re asking what happened somewhere between conception and an ongoing pregnancy — and whether there are any clues we can actually do something useful with.
Sometimes the answer is chromosomal. Sometimes there is a recognised medical factor. Sometimes several smaller things may be relevant. And frustratingly, sometimes even after investigation there still isn’t a neat explanation.
Recurrent miscarriage causes are also very quickly turned into something the woman has done wrong.
Her egg quality wasn't good enough. She didn’t rest enough. She exercised too much. She drank the wine. She ate the wrong thing. She was too stressed.
And I’m not saying that nothing about our health matters. Of course it does.
But there is a huge difference between looking intelligently at the factors that may be relevant and searching for something to blame yourself for.
We’ll get to the male factor in a second. But for now, sit with this:
A miscarriage is not proof that you failed to do pregnancy properly.
It tells us that the pregnancy was not able to continue.
So really we should be asking
“What do we actually know about what happened, what has already been ruled out, and is there anything in the wider fertility picture that deserves a closer look?”
Because those are three very different questions.
And that is where recurrent miscarriage becomes more complex than simply looking at one hormone result, one scan, one diagnosis or one egg-quality label.
Why can miscarriage happen when tests are normal?
So let's get to it then, because miscarriage with normal tests is one of the most frustrating places to be. But, a seemingly miscarriage no reason/ unexplained miscarriage doesn't mean there isn't something underlying.
They key here is to understand what that could be rather than beating yourself up. Because when we understand, we can then make changes for next time.
The reason that tests normal after miscarriage can often literally be that the tests don't cover everything. It would be impossible, and so that's not a failing on the part of your specialist or GP, it's just that there is only ever so much that they can financially test.
And I don't want you to think that I'm shaming doctors here, but they also only look for parameters. "You're in the normal range for this and the normal range for that so go away and keep trying". However, you wouldn't believe the number of times that I've literally only looked at those blood test results and found an important clue because normal parameters are NOT THE SAME as normal patterns. You can still be low in one thing and high in another whilst still being in normal ranges.
Example
Let me give you an example.
I was looking at the results of a lady I'd worked with who had been told that everything was normal.
And broadly speaking, it was.
Nothing was flashing red on the page saying, “HERE I AM, THIS IS THE PROBLEM.”
But when I went into the detail, her red blood cells were sitting on the larger side, while the part of the picture relating to their oxygen-carrying capacity was sitting towards the lower end.
Now, that doesn't diagnose anything on its own.
But it does make me ask another question.
Why?
Red blood cells contain haemoglobin, which is responsible for carrying oxygen around the body. Your tissues need that oxygen constantly to make energy and do their jobs properly.
So if I have larger cells over here, but the oxygen-carrying picture isn't looking equally robust over there, I'm interested.
Not because I've suddenly found “the cause”.
Because I've found a clue.
Then I look away from the blood test.
What else is going on?
For now, park that example there. I'll come back to it.
Later, we'll come back to it and start joining it to the other pieces of her fertility picture. Suffice to say that causes of recurrent pregnancy loss are not always found entirely in test results. Our body speaks in clues and doctors aren't trained to look at, or even understand, those symptom clusters. And this is why unexplained miscarriage is so common.
What can fertility tests tell you after recurrent miscarriage?
Recurrent miscarriage tests and other tests after recurrent miscarriage can be really useful because they help rule certain things in or out. Fertility testing after miscarriage may look at uterine factors, thyroid issues, antiphospholipid syndrome or selected chromosomal causes (we will come back to this), depending on your history and what your medical team feels is appropriate.
But recurrent pregnancy loss testing and other miscarriage investigations still only tell you about the things that were actually tested.
So when everything comes back “normal”, it doesn’t automatically mean your whole fertility picture has been explained.
And that gap — between what has been tested and what still hasn’t been understood — is where I want us to go next.
Read: Pregnancy after miscarriage
What deserves a closer look after repeated miscarriage?
This is where I want you to start looking at the whole picture rather than one diagnosis in isolation.
Because yes, there are recognised things that can sit alongside recurrent miscarriage and fertility problems.
Endometriosis, adenomyosis and the uterine environment
Endometriosis and miscarriage can be relevant because endometriosis may affect the pelvic environment, inflammation and, depending on where it is, anatomy too.
Adenomyosis and miscarriage can matter because adenomyosis affects the uterus itself, so we're now thinking much more about the environment an embryo is trying to implant and grow within.
Thyroid and miscarriage is another one worth looking at because thyroid function is closely tied into reproduction and pregnancy.
PCOS and miscarriage can sometimes be part of the picture too, particularly where ovulation, hormones or metabolic factors are involved.
Then there is sperm health and miscarriage, which gets ignored far too often because once a woman is pregnant everyone naturally looks at her body. But the sperm contributed half of the genetic material to that embryo.
Egg quality and miscarriage matters too, particularly because chromosomal problems in an embryo are one of the major recognised causes of miscarriage.
And of course age and miscarriage overlap with that because chromosomal risk increases as we get older (again we'll come back to this).
Then we've got uterine health and uterine factors — things like the shape of the uterus, fibroids, polyps, adenomyosis and other structural issues that may be relevant depending on the individual.
So yes, all of these things can matter.
But here's the bit I really want you to understand.
You may already know you have endometriosis.
Or PCOS.
Or thyroid issues.
Or low AMH.
Or none of the above.
And having a label still doesn't necessarily tell you how all the other pieces fit together.
This is where clusters of symptoms become really useful.
Because one symptom on its own can mean almost nothing.
Take a light period.
A light period by itself could simply be normal for you.
But what if that light period sits alongside feeling cold all the time?
Or constipation?
Or low energy?
Or low ferritin?
Or a history of thin lining?
Or spotting before your period?
Or very short cycles?
Now the picture starts to change.
And here's where it gets even more interesting.
A light period plus one cluster of symptoms may point us in one direction.
The exact same light period combined with a completely different cluster may point us somewhere else entirely.
That's why I don't particularly care about one isolated symptom.
I care about what travels with it.
So think about your own picture for a second.
Do you have one symptom you've always dismissed because it seemed unrelated?
Do you have several little things that nobody has ever put together?
Have you been told your results are normal, but you still feel like something doesn't add up?
Have you been given a diagnosis that explains one part of your fertility story, but not why pregnancy keeps ending?
Because that is where the useful information often sits.
Not in one dramatic red flag.
In the pattern.
So now back to our example
In this lady's case there were other things sitting around it — signs involving hair, skin, lips, nails and menstrual patterns. There were also digestive symptoms: food-related fatigue, gas, puffiness and fluid retention, with her bowel habits changing around too.
Now we've got more than one random number on a blood test.
We've got a little cluster beginning to form.
And this is where it becomes completely different from looking at each thing separately.
If you Googled “large red blood cells”, you'd get one list.
If you Googled bloating, you'd get another.
Fatigue would give you another.
Changes to your period would give you another.
And you'd probably finish the evening with 17 browser tabs open and £200-worth of supplements in your basket.
But they're all happening inside the same woman.
So my interest wasn't simply, “How do we make the red blood cells smaller?”
It was:
Why is this pattern there?
Is she actually getting what she needs from what she's eating and taking?
Is she absorbing and processing it properly?
Is her body using it effectively?
What else in her history fits with that picture?
And what happens when I put those findings alongside her fertility history?
That's where we'll leave her for the moment.
Because later I'm going to bring her back and show you what happened when we joined this clue to the next one.
And you'll see why looking at a single “normal” result can be completely different from understanding the pattern those results sit inside.
Hormones and recurrent miscarriage
And once we start looking at those patterns together — your cycles, symptoms, bloods, diagnoses, digestion, energy, inflammation, hormones, previous pregnancies and treatment history — we can start asking much better questions about what may actually deserve attention in your case.
That is the difference between looking at a list of possible recurrent miscarriage causes and actually understanding your own recurrent miscarriage and fertility picture.
And if you're already starting to think, “Hang on, I have a few things that seem to cluster together,” good.
Because that's exactly where we can start to make improvements.
Also, when you're dealing with unexplained recurrent miscarriage, we need to remember that if there is no cause found for miscarriage the doctor's struggle then to help you sort this out with amended treatment protocol so this can then have a knock on effect for future rounds, particularly where we're talking about IVF. That's why it's so important to understand repeated miscarriage causes as soon as we can in the fertility process.
What should I do after recurrent miscarriage when no cause has been found?
If you're sitting there thinking recurrent miscarriage — what next?, especially after being told that nothing obvious has shown up on your tests, I completely understand why you feel stuck.
Because what are you supposed to do with “we can't find a reason”?
If you've been searching what to do after recurrent miscarriage or what to do after multiple miscarriages, you've probably already found the usual advice.
Take folic acid.
Eat well.
Try not to stress.
Wait until you're ready and try again.
And none of those are necessarily wrong.
They're just not very helpful when you've already done all of that and you're still no clearer on why this keeps happening to you.
This is where unexplained recurrent miscarriage — what next? becomes a much more useful question.
Because “unexplained” doesn't mean imaginary.
It means the investigations you've had haven't found a clear explanation.
So rather than throwing everything at your body and hoping something sticks, wouldn't it be better to go deeper than the doctors have been able to with their tests, and use that information, combine it with what your body tells us every day, to find where your body needs additional support.
For example:
What happened in each pregnancy?
Was there a pattern to when the losses happened?
What do your cycles look like?
What diagnoses do you already have?
What symptoms have been sitting in the background for years that nobody has connected to anything?
What do your blood results look like when we stop looking at every marker separately?
What about your partner?
What has actually been investigated properly, and what has simply been assumed to be fine?
That is what useful fertility help after miscarriage should look like.
Not promising you that there is one hidden answer waiting to be found, because often there's a triage of interrelated things going on under the surface that interact and affect each other.
And I don't believe in handing you another shopping list of expensive supplements that could bankrupt you!
I want to help you work out which parts of your fertility picture actually deserve your attention, so you're not trying to fix everything at once.
And that is exactly why I created the Free Fertility Analysis.
It takes you through the different parts of your fertility picture and helps you start seeing where your own clusters may be sitting.
Because after recurrent miscarriage, the last thing you need is more noise. Your head is already buzzing.
No!
You need to know where to look next.
Take the Free Fertility Analysis here.
Let's pick up our example again
So, what did that cluster actually tell me?
Not that she had one magic deficiency we could fix with another supplement.
Quite the opposite.
When I put the blood pattern together with what was happening with her hair, skin, nails, periods, digestion, energy and fluid regulation, it suggested that replenishment wasn't happening as efficiently as I wanted it to.
In other words, the issue wasn't necessarily that she wasn't putting enough good stuff in.
She already was.
But her body wasn't actually processing it, absorbing it, transporting it and using it properly once it got there.
And there's not much point sending more and more deliveries to a factory if the loading bay is backed up and half of what arrives can't get where it needs to go.
And that changed what I would focus on first.
I wouldn't simply look at one blood marker and say, “Take more of this.”
I'd want to understand why that pattern had appeared in the first place and what else in her body was feeding into it.
That is the difference between looking at individual results and looking at the cluster they create together.
And it's also why two women can have the same blood result and need completely different support.
Because the number might be the same.
The picture around it isn't.
Take your Free Fertility Analysis here.
Egg quality, age and pregnancy loss
This is one of the areas where I think we have to be really clear, because egg quality, age and pregnancy loss are connected — but not in the simplistic “your eggs are bad” way that women so often walk away believing.
If you've been told that a chromosomal abnormality may have caused your miscarriage, I've gone into what that actually means — and importantly, what you can and can't influence before trying again — here.
Male factor and recurrent miscarriage
Sperm health and miscarriage deserves its own mention because pregnancy loss isn't automatically a female issue. The sperm contributed half of the genetic material that created that embryo, and newer recurrent-miscarriage guidance increasingly recognises that paternal factors — particularly sperm DNA fragmentation in selected cases — may deserve investigation.
I've gone into what that means, what a normal semen analysis can miss and what men can realistically do before trying again here: Can Sperm Cause Recurrent Miscarriage?
