No heartbeat on an early ultrasound: what it can mean and what happens next
By the mybaby4D teamUpdated 13 min read
The short answer
No heartbeat on an early ultrasound can simply mean it’s early: the dates may be off, it may have been a belly scan, or the embryo may be tiny. It can also be a sign of an early loss or a pregnancy outside the uterus, and only your doctor or midwife can tell which. Doctors use strict consensus criteria, applied to an internal scan, before calling it a loss; when findings are only suspicious, a repeat scan 7 to 10 days later is generally appropriate. Tell your doctor or midwife, even if you feel well.
Covered below: how doctors decide, what comes next, what to ask, and when not to wait.
What “no heartbeat yet” can mean
An early scan with no heartbeat can simply mean it’s early. It can also be a sign of a problem, and only your doctor or midwife can tell which.
It may be too early to see
The dates may be off. Weeks are counted from the first day of your last period, and conception typically happens about two weeks later (Mayo Clinic). But in most women, ovulation comes around 10 to 16 days before the next period (NHS). In a longer cycle, the pregnancy can be younger than the calendar says. How far along am I? explains why dates disagree, and Measuring behind on your first ultrasound covers size.
The embryo may be tiny. It first shows beside the yolk sac at about 6 weeks (Doubilet and colleagues, 2013), only about 2 to 5 millimeters long (AAFP, 2009). But the heartbeat is usually visible as soon as the embryo is, so a small embryo with no heartbeat counts as suspicious for a loss, though not diagnostic. When can you see the heartbeat on an ultrasound? covers the normal timing.
It may be an early loss
Sometimes a pregnancy stops developing in the first weeks. Doctors call this early pregnancy loss. You may also hear “anembryonic pregnancy,” for a sac that has grown without an embryo, or the older “blighted ovum,” which a 2024 multisociety lexicon says to avoid (Society of Radiologists in Ultrasound, 2024).
It may not be in the uterus
If an internal scan shows no pregnancy in the uterus or outside it, doctors call it a pregnancy of unknown location. The same lexicon calls the term “a diagnostic placeholder.” It can turn out to be an early pregnancy in the uterus, an early loss, or an ectopic pregnancy, growing outside the main cavity of the uterus (AAFP, 2019, Mayo Clinic). AAFP’s review puts the incidence of ectopic pregnancy at 1% to 2% in the U.S.
Telling these apart can take more than one scan, and sometimes blood tests. Tell your doctor or midwife, even if you feel well.
How doctors tell “too early” from a loss
The consensus criteria come from a multispecialty panel convened by the Society of Radiologists in Ultrasound in October 2012. Doubilet and colleagues published them in the New England Journal of Medicine in 2013. The society’s 2024 lexicon says they “remain unaltered for the purposes of this lexicon,” while noting that new research continues to emerge.
The panel’s aim was to avoid calling a wanted pregnancy lost when it isn’t. The consequence of a false diagnosis “may be dire,” the paper says: treatment that ends or severely damages a viable pregnancy. So the criteria “should virtually eliminate false positive results.”
Rules for doctors, not for your printout
These are rules doctors apply to medical scans, and only a doctor can apply them, with the whole scan in view. They’re written for internal scans. Please don’t hold a printout or portal report up against the lists below. A number without the rest of the scan can mislead you either way.
Findings that are diagnostic of pregnancy failure
A crown-rump length (the embryo’s length from head to bottom) of 7 millimeters or more, and no heartbeat.
A mean sac diameter (the average of three measurements of the pregnancy sac) of 25 millimeters or more, and no embryo.
No embryo with a heartbeat 2 weeks or more after a scan that showed a gestational sac without a yolk sac.
No embryo with a heartbeat 11 days or more after a scan that showed a gestational sac with a yolk sac.
Findings that are suspicious, but not diagnostic
A crown-rump length under 7 millimeters, and no heartbeat.
A mean sac diameter of 16 to 24 millimeters, and no embryo.
No embryo with a heartbeat 7 to 13 days after a scan that showed a gestational sac without a yolk sac.
No embryo with a heartbeat 7 to 10 days after a scan that showed a gestational sac with a yolk sac.
No embryo 6 weeks or more after the last menstrual period.
An “empty amnion”: an amnion seen next to the yolk sac, with no visible embryo.
An enlarged yolk sac, over 7 millimeters.
A small gestational sac for the size of the embryo: less than 5 millimeters’ difference between the mean sac diameter and the crown-rump length.
When findings are suspicious, a follow-up scan “at 7 to 10 days to assess the pregnancy for viability is generally appropriate,” the paper says (Doubilet and colleagues).
Why the cut-offs are cautious
The paper notes that “cardiac activity is usually visible as soon as an embryo is detectable,” so no heartbeat in an embryo under 7 millimeters is suspicious, though not diagnostic. The panel chose 7 millimeters rather than 5 for the embryo, and 25 rather than 16 for the sac. Larger studies had described several embryos of 5 to 6 millimeters with no heartbeat that later proved viable. Measurements also vary between observers, by plus or minus 15% for crown-rump length and 19% for sac diameter.
The UK view
In the UK, NICE adds a step. With a crown-rump length of 7.0 millimeters or more and no visible heartbeat on an internal scan, it asks for a second opinion and/or a second scan at least 7 days later before a diagnosis. Likewise for a sac of 25.0 millimeters or more with no visible embryo. If the measurements come from a scan over the belly, NICE asks for a second scan at least 14 days later. NICE also says: “Do not use gestational age from the last menstrual period alone to determine whether a fetal heartbeat should be visible” (NICE).
What happens next
A repeat scan. Your doctor or midwife sets the timing. For suspicious findings, a follow-up scan 7 to 10 days later is generally appropriate under the consensus criteria. NICE sets a minimum of 7 days after an internal scan, and 14 days after a scan over the belly.
hCG blood tests. hCG is the hormone a pregnancy test detects. Mayo Clinic says the level is “often repeated after 48 hours.” When the pregnancy’s location is unknown, NICE asks for two tests “as near as possible to 48 hours apart (but no earlier).” Doctors look at the change, not one number.
What the change can show. A slower rise than expected “suggests early pregnancy loss or ectopic pregnancy,” says AAFP’s 2019 review. But the rise can look similar whether the pregnancy is early and in the uterus, ectopic, or a loss (AAFP, 2019). A single result, “regardless of its value,” can’t reliably tell an ectopic pregnancy from one in the uterus (Doubilet and colleagues). AAFP’s cut-offs depend on the starting level, and NICE uses different ones, so leave the arithmetic to your doctor or midwife.
A plan, if the location is unknown. For people who are stable, AAFP’s review recommends “close monitoring of symptoms, serial quantitative β-hCG testing, and ultrasonography” until there’s a diagnosis. Patients should be told the warning signs of ectopic pregnancy, “including shoulder pain, pelvic pain, and dizziness.” In the UK, NICE adds written advice on new or worsening symptoms and 24-hour emergency care.
Why don’t doctors treat for an ectopic pregnancy straight away? In someone with a pregnancy of unknown location, the consensus paper sees “limited risk in taking a few extra days to make a definitive diagnosis.” That holds if there are no signs or symptoms of rupture and no ultrasound signs of ectopic pregnancy. A new symptom changes that picture.
It’s hard to think straight in that room, so write these down.
What exactly did the scan show? A sac, a yolk sac, an embryo? Was it an internal scan?
Are the findings diagnostic, or only suspicious?
When is my next scan or blood test, and how will I get the results?
Is this a pregnancy of unknown location? If so, what’s the plan?
Could my dates be off? Mention long or irregular cycles.
Which symptoms mean I should go to the emergency room? And who do I call after hours?
If this is a loss, what are my options, and do I need to decide now?
When to go now
While you wait, symptoms matter more than numbers. NICE tells UK clinicians to “place more importance on clinical symptoms than on serum hCG results” when a pregnancy’s location is unknown.
Severe pain, heavy bleeding, pain in the tip of your shoulder, or feeling faint?
These can be signs of an ectopic pregnancy, which is an emergency (Mayo Clinic). Call 911 or go to the emergency room now. For milder pain or spotting, call your doctor or midwife today. A keepsake scan can’t check on your health.
In the UK, call 999 or go to A&E for any of the symptoms above. The NHS says to call 999 if you’re pregnant with vaginal bleeding and the bleeding is heavy, or you have severe tummy pain or pain in your shoulder, or you feel sick, faint or dizzy (NHS). For light bleeding or spotting with no pain or only mild pain, call your maternity unit if you have the number. If you’re less than 20 weeks pregnant, an early pregnancy unit may be able to help, and if you can’t reach one, call NHS 111 (NHS).
Getting through the wait
A week can feel very long. Some things help.
Get the plan in writing: the date of your next scan or test, and the number to call after hours.
Choose who knows: one or two people who can come to the next scan with you, or wait outside.
Go easy on forums: other people’s results came with their own dates and history.
If the worry starts to take over, tell your doctor or midwife. In the U.S., call or text the National Maternal Mental Health Hotline at 1-833-TLC-MAMA (1-833-852-6262). It’s free, confidential and available 24/7 in English and Spanish (HRSA). Postpartum Support International’s HelpLine, 1-800-944-4773, offers support and resources, and PSI runs free online groups, including one for pregnancy after a loss (PSI, PSI groups).
If your doctor or midwife confirms a loss, you’re far from alone. About 10% to 20% of known pregnancies end in miscarriage, and “most of the time, miscarriage happens because of a random event that is no one’s fault” (Mayo Clinic).
There are options, which your doctor or midwife can talk through with you. Depending on your situation, they can include waiting for the pregnancy to pass on its own, medicine to help it pass, or a minor procedure called suction dilation and curettage (D&C) (Mayo Clinic, AAFP).
Whatever the week, it’s a real loss, and “emotional healing can take much longer than physical healing,” as Mayo Clinic puts it. Tell your doctor or midwife if sadness or stress doesn’t ease. PSI’s HelpLine offers support and resources, and its free online groups include one for early pregnancy loss (PSI). In the UK, your GP surgery or pregnancy unit can point you to counselling and other support, including for partners (NHS).
At an elective scan, ours included
A keepsake scan can’t decide any of this. At our studio in Glendale, the Pregnancy Check is a short, private 2D ultrasound in the first 10 weeks. We tell you what we could and couldn’t see, but we can’t diagnose, date a pregnancy, check on your health, or tell you everything is OK.
If it’s too early to see, you come back for a second look, almost always at no charge. That’s a keepsake too, not the follow-up scan your doctor or midwife may order. Whatever any scan shows, tell your doctor or midwife, even if you feel well.
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Questions
Can you have no heartbeat at 6 weeks and still have a healthy pregnancy?
It’s possible for the pregnancy to carry on. At 6 weeks the embryo may be too small, the dates may be off, or it may have been a belly scan. Under consensus criteria, no heartbeat in an embryo under 7 millimeters is suspicious, not diagnostic, but it can also be a sign of a problem. Tell your doctor or midwife, even if you feel well: only they can tell which.
How long after no heartbeat should I have another scan?
Your doctor or midwife sets the timing. For suspicious findings, consensus criteria say a follow-up scan 7 to 10 days later is generally appropriate. UK guidance says at least 7 days after an internal scan, or 14 days after a scan over the belly. With severe pain, heavy bleeding, shoulder-tip pain or feeling faint before then, call 911 (999 in the UK) or go to the emergency room now.
What is a fetal pole?
An older name for the embryo as it first appears on an internal scan, beside the yolk sac, at about 6 weeks. The 2024 lexicon from the Society of Radiologists in Ultrasound calls the term “obsolete” and uses “embryo.” Not seeing one yet can simply mean it’s early, but it can also be a sign of a problem, and only your doctor or midwife can tell which. Tell your doctor or midwife, even if you feel well.
Does no heartbeat always mean miscarriage?
Not always. It can simply mean it’s early, or that the dates are off. It can also be a sign of an early loss or a pregnancy outside the uterus, and only your doctor or midwife can tell which. Tell your doctor or midwife, even if you feel well.
Can wrong dates explain no heartbeat at 8 weeks?
Sometimes, if the pregnancy is younger than the calendar says. For a pregnancy conceived without medical help, consensus criteria call last-period dates “too unreliable” for a definite diagnosis of loss, and UK guidance says not to use them alone to judge whether a heartbeat should show. Doctors go by what the scan shows, such as the embryo’s size, and by repeat scans. No heartbeat can also be a sign of a problem, so tell your doctor or midwife, even if you feel well.
Is 5 weeks too early for an ultrasound?
For an embryo or heartbeat, yes. On an internal scan, counted from your last period, the sac is first seen at about 5 weeks, the yolk sac at about 5½, and the embryo, with its heartbeat, at about 6. A scan over the belly shows each about a week later. An empty-looking screen then can simply mean it’s early, but it can also be a sign of a problem: tell your doctor or midwife, even if you feel well.
What does no fetal pole at 6 weeks mean?
On its own, consensus criteria call it suspicious, not diagnostic. For a pregnancy conceived without medical help, they call last-period dates “too unreliable” for a definite diagnosis. It can simply mean it’s early, or be a sign of a problem, and a follow-up scan 7 to 10 days later is generally appropriate. Tell your doctor or midwife, even if you feel well.
An early look can help after a loss, but no scan can promise how a pregnancy will go. The care you may be offered, what to ask for at a scan, and support.
On an internal medical scan, two sacs can show from about 5 weeks and two heartbeats from about 6. Early scans can miss a twin; later medical scans settle it.
No harm to babies reported in over 40 years of medical use, says the WFUMB. The FDA says long-term effects are unknown and discourages keepsake-only scans.
Updated October 13, 2026
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