Finding out that you are pregnant is an important milestone, and one of the first questions many women ask is when they should have their first ultrasound scan.
Although a pregnancy may be visible on ultrasound from around five weeks, the earliest possible scan is not necessarily the most informative. Choosing the right time depends on what you would like to find out and whether there are any symptoms or clinical concerns.
Key points
- For women who are well and have no particular concerns, around seven weeks of pregnancy is often a good time for a first early pregnancy scan.
- At around seven weeks, the pregnancy is usually sufficiently developed for ultrasound to provide a more informative assessment.
- An earlier assessment may be appropriate if you have symptoms or a medical history that increases the likelihood of early pregnancy complications.
- An early pregnancy scan is usually performed through the abdomen (transabdominal ultrasound) or, when necessary, transvaginally.
When is the best time for my first pregnancy scan?
For women who are well and have no particular concerns, around seven weeks of pregnancy is often a good time for a first early pregnancy scan.
By this stage, ultrasound can usually confirm that the pregnancy is developing within the uterus, identify the embryo and its heart activity, and measure the embryo to help assess pregnancy dating.
Scanning earlier is possible, but there is a greater chance that some pregnancy structures may not yet be visible. This can lead to uncertainty and the need for a repeat examination.
It is also important to remember that an early pregnancy scan at six or seven weeks is not routinely necessary for every woman. In the NHS, the first routine pregnancy ultrasound is generally offered between 10 and 14 weeks.
Can I have a pregnancy scan at five or six weeks?
Yes. An early pregnancy scan can be performed at five or six weeks, usually using transvaginal ultrasound.
At approximately five weeks, a small gestational sac may be visible within the uterus, although it may be too early to identify the embryo or heart activity. A fluid-filled structure alone does not definitively establish an intrauterine pregnancy.
By six weeks, the yolk sac and embryo may be visible, and heart activity can sometimes be identified.
However, not seeing an embryo or heart activity at this stage does not automatically mean that something is wrong.
Pregnancy dates are commonly calculated from the first day of the last menstrual period. If ovulation occurred later than expected, the pregnancy may be less advanced than the menstrual dates suggest.
For a more detailed explanation, read our guide: What Can You See on a Pregnancy Scan at 5, 6, 7 and 8 Weeks?
Why is around seven weeks a good time for a first scan?
At around seven weeks, the pregnancy is usually sufficiently developed for ultrasound to provide a more informative assessment.
A first scan can generally establish:
- Whether the pregnancy is developing within the uterus.
- Whether there is one baby or a multiple pregnancy.
- Whether an embryo and heart activity can be identified.
- The crown–rump length (CRL), which helps assess early development and pregnancy dating.
Although these findings are usually clearer at seven weeks, the exact appearance depends on the stage of development and the quality of the ultrasound examination.
For women seeking reassurance in an otherwise uncomplicated early pregnancy, waiting until approximately seven weeks can therefore reduce the likelihood of an inconclusive scan.
When might I need an earlier pregnancy scan?
An earlier assessment may be appropriate if you have symptoms or a medical history that increases the likelihood of early pregnancy complications.
These circumstances include:
- Vaginal bleeding.
- Persistent or significant abdominal or pelvic pain.
- A previous ectopic pregnancy.
- A previous Caesarean scar pregnancy.
- Pregnancy following certain fertility treatments.
- Previous significant early pregnancy complications.
- Other concerns for which your healthcare professional recommends an earlier assessment.
In these situations, the purpose of the scan may be to establish the location of the pregnancy or investigate symptoms rather than simply confirm heart activity.
If you have pain or bleeding, you should seek appropriate clinical advice rather than waiting until seven weeks for a routine scan.
What happens during my first pregnancy scan?
An early pregnancy scan is usually performed through the abdomen (transabdominal ultrasound) or, when necessary, transvaginally.
At or after seven weeks of pregnancy, an abdominal ultrasound scan performed through your tummy can usually provide clear views of the pregnancy, including the gestational sac, yolk sac, embryo and heart activity.
Occasionally, however, it may be difficult to obtain sufficiently clear images. This can happen if the uterus is tilted backwards (retroverted uterus), if uterine fibroids are present, if the bladder is not adequately filled, or if the pregnancy is earlier than expected.
In these circumstances, a transvaginal ultrasound scan may be offered to obtain clearer and more detailed images.
A transvaginal scan involves gently inserting a slim ultrasound probe into the vagina, allowing the pregnancy to be examined from closer to the uterus. It is safe in early pregnancy and does not increase the risk of miscarriage.
Your clinician will explain the examination and discuss whether a transvaginal scan would provide additional useful information before proceeding.
During the scan, the location and development of the pregnancy, the number of embryos, heart activity and appropriate pregnancy measurements are assessed. The findings will be explained to you, together with any recommendations for further assessment or follow-up.
What if my first scan is inconclusive?
Occasionally, an early scan may not provide a definite answer about pregnancy development or viability.
This is more likely when the scan is performed very early or when the pregnancy is less advanced than expected.
An inconclusive early scan does not necessarily mean miscarriage.
If you are clinically stable and there are no symptoms requiring urgent investigation, a repeat ultrasound may be recommended after an appropriate interval, based on the initial findings and national guidance.
Where the location of the pregnancy remains uncertain, additional assessment, including serial blood tests for the pregnancy hormone β-hCG, may be necessary.
Your clinician should provide a clear follow-up plan and explain which symptoms require urgent reassessment. If symptoms develop or worsen, you should seek medical advice promptly rather than waiting for your next scan.
For further information, read: No Heartbeat on an Early Pregnancy Scan: Is It Too Early?
When should I seek urgent medical attention?
Although mild discomfort and spotting can occur in early pregnancy, some symptoms require urgent assessment.
Seek urgent help if you have heavy vaginal bleeding, severe or worsening abdominal pain, significant one-sided pelvic pain, shoulder-tip pain, dizziness, fainting or collapse.
If you experience severe symptoms, attend an Emergency Department or call 999. For other urgent concerns, contact your local NHS Early Pregnancy Assessment Service or NHS 111.
A routine private pregnancy scan should never delay urgent medical assessment.
Choosing the right time for your first pregnancy scan
For most women without symptoms or particular clinical concerns, around seven weeks is often an excellent time for a first early pregnancy scan.
An earlier scan may be appropriate when there are symptoms, previous complications or other medical reasons for assessment.
The most useful time for your first scan therefore depends not simply on how early ultrasound can detect a pregnancy, but on what information is needed for your individual circumstances.
Related pregnancy guides
Frequently asked questions
When is the best time for my first pregnancy scan?
For women who are well and have no particular concerns, around seven weeks of pregnancy is often a good time for a first early pregnancy scan.
Can I have a pregnancy scan at five or six weeks?
Yes. An early pregnancy scan can be performed at five or six weeks, usually using transvaginal ultrasound.
Why is around seven weeks a good time for a first scan?
At around seven weeks, the pregnancy is usually sufficiently developed for ultrasound to provide a more informative assessment.
When might I need an earlier pregnancy scan?
An earlier assessment may be appropriate if you have symptoms or a medical history that increases the likelihood of early pregnancy complications.
What happens during my first pregnancy scan?
An early pregnancy scan is usually performed through the abdomen (transabdominal ultrasound) or, when necessary, transvaginally.
What if my first scan is inconclusive?
Occasionally, an early scan may not provide a definite answer about pregnancy development or viability.
Early pregnancy care at The Pregnancy Clinic
At The Pregnancy Clinic, early pregnancy scans are provided as part of a consultant-led pregnancy and fetal medicine service.
Your ultrasound findings are considered alongside your pregnancy history, symptoms and individual circumstances, with clear explanations and appropriate advice about further assessment where needed.
Book an early pregnancy scan →The Pregnancy Clinic is not an emergency service. If you have severe pain, heavy bleeding, fainting or other acute symptoms, please seek urgent NHS assessment.