6-Week Scan: Complete Guide
A scan at 6 weeks is very early — it isn't part of routine NHS antenatal care, which starts with the dating scan around 10-14 weeks — but many women choose a private early scan at this point for reassurance, especially after a previous loss, or to confirm dates. Here's what to expect and how to interpret what you see.
What you can see at 6 weeks
At this stage, the baby is still tiny (a few millimetres long), so the scan is looking for early markers of a developing pregnancy rather than the baby itself.
- Gestational sac — the fluid-filled sac that houses the developing pregnancy, usually visible from around 5 weeks.
- Yolk sac — a small round structure inside the gestational sac that nourishes the early embryo before the placenta takes over; it's often the first clear sign of a viable pregnancy.
- Fetal pole — the earliest visible form of the embryo, which may or may not be seen at 6 weeks depending on exact dating.
- Heartbeat — a flicker of cardiac activity can sometimes be seen from around 6 weeks, but it's just as common not to see one yet, especially if you're slightly earlier than 6 weeks by your dates.
Why women choose a 6-week scan
Reasons vary but commonly include reassurance after previous miscarriage or ectopic pregnancy, uncertainty about dates (for example with irregular cycles), a history of fertility treatment, or simply wanting an early look. These scans are private, as the NHS doesn't routinely scan this early unless there's a specific concern such as bleeding or pain. Cost is typically in the region of £60-£150 — choose a clinic with sonographers experienced in early pregnancy scanning.
If no heartbeat is seen
Try not to panic if a heartbeat isn't visible at exactly 6 weeks — this is common and usually just means it's slightly too early, either because ovulation happened later than expected or dating is a few days out. Clinics will typically recommend a follow-up scan 1-2 weeks later, by which point a heartbeat is almost always visible in an ongoing pregnancy. If you have bleeding, pain, or the clinic has specific concerns, they'll advise on next steps and may refer you to an early pregnancy unit.
Frequently Asked Questions
What can you see at a 6-week scan?
You can typically see the gestational sac and yolk sac, and sometimes a fetal pole with a flicker of heartbeat. The baby is still extremely small at this stage, so many of the details visible at later scans, such as limbs or facial features, aren't yet present. A trained sonographer will explain exactly what's been seen.
Should I have a scan at 6 weeks?
It's entirely optional and a personal choice — the NHS doesn't offer routine scanning this early. Many women wait until the standard dating scan around 10-14 weeks, while others choose a private early scan for reassurance, particularly after previous loss or with uncertain dates. There's no medical requirement to have one this early unless you have symptoms like bleeding or pain, in which case contact your GP or midwife rather than booking a private scan.
What if no heartbeat is seen at 6 weeks?
This is common and doesn't necessarily mean anything is wrong — dating can be a few days out, and a heartbeat often isn't visible until closer to 6-7 weeks. Clinics usually recommend a follow-up scan a week or two later, when a heartbeat is typically seen if the pregnancy is progressing normally. If you have bleeding or pain alongside no heartbeat, contact your GP, midwife, or early pregnancy unit for advice.
This article is for informational purposes only and does not constitute medical advice.
Related articles: