When Is My 12-Week Scan?
Last reviewed: July 2026
Enter your dates below to see exactly what pregnancy week you are in, which will help you estimate the timing of your first NHS dating scan.
This page is for general pregnancy planning and date guidance only. It is not medical advice, diagnosis, or treatment. Pregnancy dates are estimates and can change after a scan or advice from your midwife, GP, or maternity team. Always speak to a qualified healthcare professional if you have symptoms, concerns, or questions about your pregnancy.
Calculate Your Due Date
About Your NHS Dating Scan
In the UK, your first official NHS ultrasound is commonly known as the "12-week scan" or the "dating scan". However, it rarely happens at exactly 12 weeks pregnant.
Typically, this scan takes place anywhere between 10 weeks and 14 weeks plus 1 day.
What happens at the 12-week scan?
- Confirm the due date: The sonographer will measure the baby from head to bottom (crown-rump length or CRL) to give you a more accurate Estimated Due Date (EDD).
- Check development: They will check the baby's heartbeat and basic physical development.
- Screening: You may be offered the combined screening test for Down's syndrome, Edwards' syndrome, and Patau's syndrome.
- Multiples: They will check if you are expecting twins or more!