No Heartbeat at 6 Weeks: What It Means

Being told there's no heartbeat at your 6-week scan is one of the most frightening moments in early pregnancy. But before you fear the worst, it's important to understand that this is very common and often completely normal. Here's what it means and what happens next.

Table of Contents

1. Why There May Be No Heartbeat at 6 Weeks
2. How Common Is It?
3. What Happens Next
4. When It Could Mean a Loss
5. How to Cope While Waiting
6. Questions to Ask Your Sonographer

Why There May Be No Heartbeat at 6 Weeks

• You're earlier than you think: This is the most common reason. If your cycle is irregular, you ovulated late, or you miscounted, you might actually be 5+4 or 5+5 rather than 6+2. At that stage, the heart is only just beginning to beat and may not yet be detectable.
• The heart has only just started: The fetal heart starts beating at around 5+5 to 6+1. At the very beginning, the beat is faint and slow, and may not be picked up by ultrasound.
• The scan was abdominal: Abdominal scans detect the heartbeat later than transvaginal scans. If you had an abdominal scan at 6 weeks, the heartbeat may simply not be visible through your tummy yet.
• Equipment limitations: Not all ultrasound machines are equally sensitive. A basic machine may miss a very early heartbeat that a high-end one would detect.

How Common Is It?

The key number to know is the CRL (crown-rump length). Current guidance says that if the CRL is under 7mm, a heartbeat may not yet be visible and a repeat scan should be offered before any diagnosis is made. Only if the CRL is 7mm or more and there's no heartbeat should a missed miscarriage be considered — and even then, a repeat scan is recommended to confirm.

What Happens Next

1. Measure the CRL carefully: If it's under 7mm, you're likely earlier than expected. The heartbeat will probably be visible in a few days.
2. Check the gestational sac and yolk sac: If these are present and correctly sized, the pregnancy is likely developing normally, just a few days behind.
3. Arrange a repeat scan: Typically in 7-14 days. By then, the baby will have grown and the heartbeat should be visible if the pregnancy is progressing.
4. Advise you on symptoms to watch for: Bleeding, cramping, or fever should prompt you to contact your GP or early pregnancy unit.

You will not be given a diagnosis of miscarriage from a single 6-week scan if there's any uncertainty. This is standard NHS practice and private clinics should follow the same approach.

When It Could Mean a Loss

• The CRL is 7mm or more and no heartbeat is visible (this meets the criteria for a missed miscarriage).
• The gestational sac is large (typically 25mm or more) with no embryo visible (this suggests a blighted ovum or anembryonic pregnancy).
• A repeat scan 7-14 days later shows no growth and still no heartbeat.

Even in these cases, the guidance is to do a repeat scan before making a final diagnosis, because dating errors and unusual cases do occur. Never accept a diagnosis from a single scan without a follow-up to confirm.

If a miscarriage is confirmed, you'll be supported by your healthcare team with options for management — natural, medical, or surgical. You're not alone, and support is available through organisations like the Miscarriage Association.

How to Cope While Waiting

• Don't Google: Searching "no heartbeat at 6 weeks" will show you worst-case scenarios and increase your anxiety. The statistics are actually in your favour.
• Talk to someone: Your partner, a friend, or a family member. Don't go through this alone.
• Ask for an earlier repeat: Some early pregnancy units will scan again in 7 days if you're very anxious.
• Monitor symptoms: If you develop bleeding or severe pain, contact your GP or EPU immediately. If you feel fine, that's a good sign.
• Be kind to yourself: Take time off work if you can. Do things that distract and comfort you.
• Remember the odds: Most women who don't see a heartbeat at 6 weeks go on to see one at their repeat scan.

Questions to Ask Your Sonographer

• "What's the CRL measurement?"
• "Is the gestational sac the right size?"
• "Could I be earlier than my dates suggest?"
• "When should I come back for a repeat scan?"
• "What symptoms should prompt me to seek urgent help?"
• "Is there any chance the heartbeat will appear at the next scan?"

A good sonographer will answer these honestly and compassionately. You deserve clear information.

Frequently Asked Questions

If the CRL was under 7mm and the sac looked normal, the odds are very good — most women see a heartbeat at their repeat scan 7-14 days later. The most common reason for no heartbeat at 6 weeks is simply being earlier than expected.

Should I be having symptoms if I've miscarried?

Not necessarily. A missed miscarriage (where the baby has stopped developing but your body hasn't recognised it) often has no symptoms. That's why the repeat scan is so important — it's the only way to know for sure.

Can I do anything to help the pregnancy?

No. If the pregnancy is viable, it will continue regardless of what you do. If it isn't, nothing you did caused it. Miscarriage at this stage is almost always due to chromosomal problems that are nobody's fault.

Further reading:

• NHS — Antenatal care and screening

This article is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider.

Last reviewed: June 2026

Related articles:

• No Heartbeat at 7 Weeks
• Slow Heartbeat at 6 Weeks
• When Can You See the Heartbeat?
• What Does a 6-Week Ultrasound Look Like?