6 Week Scan
Six weeks is the earliest stage at which a private reassurance scan tends to be informative. From our Gosforth clinic in Newcastle, we look for the gestational sac, yolk sac and, in most pregnancies, that first cardiac flicker that the NHS isn't yet scanning for.
Quick Answer
A 6 week scan answers three questions: is the pregnancy in the uterus, is the gestational sac developing alongside a yolk sac, and is there a heartbeat? In around 80–90% of viable pregnancies the cardiac flicker is detectable at this stage. The embryo itself measures roughly 4–5mm, too small for recognisable photos, but more than enough for that first reassuring image. Because the NHS doesn't routinely scan this early, six weeks is exclusively private territory, usually requested after a positive home test, a previous loss, or fertility treatment. At Numi Scan Gosforth the appointment is £89, runs 15–20 minutes, and includes printed and/or digital images and a sonographer report.
What's Happening at 6 Weeks
At 6 weeks, counted, by convention, from the first day of your last period, your baby is roughly sweet-pea sized, somewhere around 4 to 5 millimetres top-to-bottom. The biology happening inside that tiny frame is extraordinary. A heart that was a simple tube only days earlier has folded and now ticks at 100 to 130 beats a minute. The brain has begun dividing into its three primary regions. The neural tube, which will mature into spine and central nervous system, has closed. The limb buds, the very first hint of arms and legs, have made their appearance.
None of that, of course, is yet recognisable to the untrained eye. On screen, a 6-week embryo looks like a small bright bean tucked inside a darker fluid-filled sac. Your sonographer isn't looking for anatomy at this point so much as confirmation: pregnancy where it should be (not in a fallopian tube), sac size matching the dates you've been working from, and a steady flicker exactly where the heart should sit.
For families who've been through a previous loss, who conceived via IVF or IUI, or who are simply finding the wait until 12 weeks unbearable, that flicker is the moment the whole thing stops feeling abstract. Which is, in the end, the entire reason the 6-week scan exists.
Why a 6 Week Scan? Three Common Reasons
Following a previous miscarriage
When you've already lost a pregnancy, the stretch from positive test to NHS dating scan at 12 weeks can feel cruelly long. A six-week look in is an early checkpoint, and the numbers shift in your favour once a heartbeat is logged: miscarriage risk drops from roughly 1 in 4 across the general population to under 1 in 10 when a heartbeat is seen at six weeks. It isn't a guarantee, but for many of the families who walk into our clinic on Bakers Yard it's the first proper exhale of the pregnancy.
After IVF, IUI or assisted conception
Most fertility clinics discharge their patients after a confirmation scan somewhere around 7–9 weeks. Some parents prefer to scan a little earlier than that, at six weeks, as an extra layer of reassurance before the handover, or to pair with an early pregnancy reassurance scan at 7–8 weeks for crisper detail before NHS midwifery picks up your care.
After a strong positive: and a need to see for yourself
Sometimes there's no clinical reason at all. The test line is unmistakable, and the idea of waiting six more weeks to see anything on a screen feels intolerable. A 6-week scan is for parents who simply want the earliest credible glimpse of what's happening, a personal choice, and a perfectly reasonable one.
What We Actually See on Screen
The 6-week image bears very little resemblance to the recognisable scan photos parents share later at 12 or 20 weeks. There's no tiny human silhouette to spot just yet. Instead, your sonographer is checking for four specific markers that, when present together, indicate a healthy early pregnancy:
- Gestational sac: a dark fluid-filled bubble nestled inside the uterus, where baby is developing. Typically appears from 4.5–5 weeks.
- Yolk sac: a smaller bright ring sitting within the gestational sac, supplying the embryo until the placenta takes over the job. Visible from around 5.5 weeks.
- Fetal pole: a slight thickening at the edge of the yolk sac that will become the embryo proper. Showing from roughly 6 weeks.
- Heartbeat: at this stage you see pulsing motion within the fetal pole rather than hearing a sound. Generally appears between 6 and 7 weeks.
All four present plus measurements aligning with your dates equals a quietly reassuring scan. If everything else is tracking and only the heartbeat hasn't yet announced itself, our usual recommendation is a recheck inside 7–10 days. Babies wriggle, dates drift; nine times out of ten the next look brings the news the whole appointment was hoping for.
Scan Package for Week 6
Early Pregnancy Viability Scan
6–9 weeks 6 days
Intrauterine pregnancy confirmation, heartbeat where visible, early dating and single or multiple pregnancy check. Printed and/or digital images and a sonographer report included.
View package →NIPT Test
From 10 weeks: the next decision point
DNA-based blood screening for Down's, Edwards' and Patau syndromes, in three tiers (Standard / Advance / Absolute). Eligible from 10 weeks, only 4 weeks after your 6-week scan. Results in 3-5 working days.
View package →Book Your 6 Week Scan
Same-day or next-day slots are often available at our Gosforth clinic. CQC-regulated, experienced and registered sonographers, two years on Bakers Yard, a fast-growing wall of five-star Google reviews since 2024.