On an internal (transvaginal) ultrasound, the heartbeat usually shows as a flicker from about 6 to 6½ weeks, counted from the first day of your last period. On a scan over the belly, expect it about a week later. Hearing it is a separate step: the handheld Doppler at a prenatal visit usually picks it up at around 10 to 12 weeks.
This guide covers what you’re actually seeing, why you see it before you can hear it, what the heart-rate numbers mean, and how to pick a day with the best chance.
What the heartbeat looks like at 6 weeks
At 6 weeks the embryo is only a millimeter or two long, a small gray shape at the edge of the pregnancy sac (Radiopaedia). The heartbeat is a fast, tiny flicker within it. If you didn’t know where to look, you could miss it, so a good sonographer holds the probe still, zooms in and points it out.
The heart is still forming at this stage. What the flicker shows is the rhythmic movement of early heart tissue, which reports call “cardiac activity.” To document it, the sonographer records a short video clip or uses M-mode, a scrolling line that turns the flicker into a wave the machine can count (ACR–ACOG–AIUM–SMFM–SRU practice parameter). That wave is where an early heart rate comes from.
You’ll only see the flicker on the live screen. A printed picture freezes one moment, so the flicker itself can’t show on paper.
When you can see it, scan by scan
Internal scan, about 6 weeks. Radiologists’ consensus guidance says an embryo with cardiac activity is “typically visualized at 6 weeks” (Society of Radiologists in Ultrasound, 2024). A review for family doctors puts it at about 6½ weeks (AAFP). Some pregnancies show it a few days earlier, and plenty a few days later.
Belly scan, about 7 weeks. Each early landmark shows about a week later on a scan over the belly than on an internal one (AAFP, StatPearls).
Handheld Doppler, about 10 to 12 weeks. That’s the little device your doctor or midwife presses on your belly to listen. Cleveland Clinic says around 10 or 12 weeks or later. The Merck Manual says it can be as early as 8 to 10, and Mayo Clinic says by about 12 to 14 (Cleveland Clinic, Merck Manual, Mayo Clinic).
All of those weeks count from the first day of your last period. If you ovulated later than usual, your pregnancy may be a few days younger than the calendar says, and the heartbeat will be on that later schedule too. How early can an ultrasound see a pregnancy? explains how the weeks are counted and what shows up before the heartbeat.
Why you see it before you can hear it
An ultrasound picture shows movement: the flicker is the heart moving. Sound is a separate tool, Doppler, which picks up the motion of blood and turns it into the galloping whoosh you’ve heard in films and on phone videos.
The ultrasound profession asks sonographers not to use that kind of Doppler just to document or listen to the heartbeat. The American Institute of Ultrasound in Medicine (AIUM) says “spectral Doppler imaging should not be used to document the fetal heart rate” unless there’s a medical reason, and recommends M-mode instead, at the lowest energy setting that does the job (AIUM). That isn’t limited to early pregnancy. The practice guideline for obstetric ultrasound also discourages routine pulsed Doppler to “listen” to early cardiac activity (ACR–ACOG–AIUM–SMFM–SRU).
The reason is energy. The FDA notes that ultrasound can heat tissue slightly, and that the long-term effects of that are still unknown, so the rule is to keep exposure as low as reasonably achievable (FDA). Showing the flicker on the screen does the job without the extra.
So if your early scan was silent, that was most likely by design. We offer heartbeat-only visits from 11 weeks, and you hear the heartbeat at a Gender Confirmation from 13 weeks. Both are keepsakes, not health checks, and the AIUM’s caution about non-medical ultrasound covers them too. Safety, in plain words has its statement.
Heart rate, week by week
An early heart beats fast, and the rate changes quickly over the first trimester. Typical figures from radiology references and a large 2020 study of IVF pregnancies (Radiopaedia, Ouyang and colleagues, 2020):
About 6 weeks: roughly 100 to 120 beats per minute when it first shows.
About 9 to 10 weeks: a peak of around 170 to 180.
By about 14 weeks: easing toward 150.
That climb and settle is the usual pattern; it follows the heart’s own development. Sources differ by a few beats on the exact peak, so treat the numbers as a guide. A single reading on a single day isn’t a verdict either way, and what a number means for your pregnancy is a question for your doctor or midwife.
One thing the heart rate can’t tell you is boy or girl. The idea that a fast heartbeat means a girl is one of the most repeated old wives’ tales, and studies haven’t backed it up (Healthline). Our boy or girl quiz runs through that tale and six others, just for fun. For the ways that work, see when you can find out boy or girl.
The best week to book, if the heartbeat is the point
If you’re booking an elective scan mainly to see the heartbeat, give yourself a few days of margin. Counted from the first day of your last period:
Regular cycles and sure of your dates: about 6½ weeks or later on an internal scan, about 7½ weeks or later on a belly scan.
Long or irregular cycles, or unsure of your last period: add a week, or call first and talk it through.
IVF: your dates are exact, and your clinic usually does the first scans.
Waiting those extra days can feel endless. It’s usually worth it: a clear flicker at 7½ weeks is a better morning than an empty-looking screen at 5½.
4D Bonding16 to 36 weeks. Faces look best from 28 to 34.Book 4D Bonding
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When you don’t see a heartbeat yet
This is the moment people dread. “No heartbeat yet” can simply mean “too early yet.” Your dates may be a few days off, it may be a belly scan rather than an internal one, or the embryo may still be very small. It can also be an early sign of a problem, and only your doctor or midwife can tell which. No heartbeat on an early ultrasound goes through the criteria doctors use and what happens next.
Doctors don’t draw conclusions from one early scan when the embryo is small. Under the consensus criteria radiologists use, no heartbeat in an embryo shorter than 7 millimeters isn’t enough to diagnose a loss. It is a reason to check again: a follow-up scan 7 to 10 days later is “generally appropriate” (Doubilet and colleagues, New England Journal of Medicine, 2013). In 2024 the Society of Radiologists in Ultrasound confirmed that those criteria remain unchanged.
At our studio, we can’t interpret what we see, and we won’t try. We tell you what we could and couldn’t see, and if it’s too early, you come back for a second look, almost always at no charge. If a scan anywhere can’t show a heartbeat, let your doctor or midwife know, even if you feel fine. They can order a medical scan and, if needed, blood tests.
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. 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.
If you’re pregnant after a loss, an early scan can carry a lot of weight. Is an early reassurance scan worth it? has a section written for you, with support lines if you need them.
What seeing the heartbeat does and doesn’t mean
Seeing the heartbeat is a good sign, and the odds keep improving with each week. In a study of 696 women with no symptoms, the risk of miscarriage after a heartbeat had been seen fell from 9.4% at 6 weeks to 4.2% at 7 and 1.5% at 8. From 9 weeks it was under 1% (Tong and colleagues, Obstetrics & Gynecology, 2008).
Those numbers come from women with no bleeding or pain, and risk is higher with bleeding, with age and in some other situations. A heartbeat lowers the odds; it doesn’t promise anything. That’s true of every scan, medical or elective, and it’s why we never tell anyone that everything is fine.
After the flicker: what comes next
Your first prenatal appointment. Many practices see you at about 8 to 10 weeks. Here’s why it isn’t sooner, and what to do until then.
The heartbeat you can hear. A handheld Doppler at your prenatal visits from around 10 to 12 weeks, or a heartbeat-only visit with us from 11 weeks. Call for the price and a time.
Boy or girl, from 13 weeks. Our Gender Confirmation tells you boy or girl, out loud or sealed in an envelope for the party, and includes hearing the heartbeat and learning the heart rate. How finding out works.
4D, from 16 weeks. Watching your baby move, live, on the big screen. About 4D sessions.
Our Pregnancy Check is a short, private 2D ultrasound in the first 10 weeks, at our studio in Glendale. It’s $100, no referral or insurance needed, and you leave with 8 black-and-white prints. As the picture comes up on the big screen, we point out what you’re looking at. Same-day appointments are often available.
With the heartbeat, timing is everything. Call (818) 243-7010 before you book, tell us the first day of your last period, and we’ll tell you whether it’s a good week to come. Irina, our lead sonographer, has done more than 30,000 pregnancy ultrasounds over nearly two decades. More about the Pregnancy Check.
Questions
Can you see a heartbeat at 5 weeks?
Rarely. At 5 weeks an internal scan usually shows the pregnancy sac, and perhaps a yolk sac by the end of the week. The heartbeat is typically seen from about 6 weeks, though the Merck Manual notes it can occasionally show as early as 5 to 6.
Is 6 weeks too early to see a heartbeat?
On an internal scan it’s often visible at 6 weeks, but not always. On a scan over the belly it may not show until about 7 weeks. If your dates might be a few days off, a little later gives better odds.
Why couldn’t I hear the heartbeat at my early scan?
Most likely by design. Ultrasound guidance discourages using Doppler just to listen, especially in the first trimester, and recommends showing the heartbeat on the screen instead. A handheld Doppler at a prenatal visit usually picks it up at around 10 to 12 weeks.
When can a Doppler pick up the heartbeat?
Usually around 10 to 12 weeks, sometimes as early as 8 to 10, and sometimes not until 12 to 14. If it isn’t found on the first try, that’s common early on, and your doctor or midwife can check with an ultrasound.
Is a home Doppler safe to use?
The FDA says fetal heartbeat monitors should be used only by trained providers, when medically necessary. A home device can mislead you both ways: silence can frighten you, and hearing a heartbeat doesn’t mean your baby is well (NHS). If you’re worried about movements or the heartbeat, call your doctor or midwife. Is an early ultrasound safe for the baby? covers home devices too.
What’s a normal heart rate at 7 weeks?
The rate climbs quickly in early pregnancy, from roughly 100 to 120 beats per minute at 6 weeks to a peak of about 170 to 180 at 9 to 10 weeks, so at 7 weeks it’s somewhere along that rise. Your doctor or midwife is the person to say what a particular reading means.
Does a fast heartbeat mean it’s a girl?
No. The heart rate changes mainly with the week of pregnancy, and studies haven’t found it a reliable way to tell boy from girl.
After IVF, a pregnancy test comes first, then your clinic’s first medical ultrasound: around 7 weeks in England’s NHS, usually 6 to 7 at one New York clinic.
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.
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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