An accurate due date, a blood test at what you thought was 13 weeks wouldn't be helpful if you were 16 weeks pregnant when the blood was taken.
If the scan date differs from your period dates, the scan date will be used.
Due date calculator dating scan
In or create a choices account if you would like to save your due date.
For example, about one in 20 women will appear to be at high risk, from the nuchal translucency scan to assess the risk of down syndrome.
If you do know the conception date, this is counted as day 14, and not day one.
You would like to save your due date, you will need to log in or create an nhs choices account - you can do this in the box below.
To find your due date, enter the date of the first day of your last period, and click 'calculate' - the calculator will do the rest.
You could have a dating scan, without nt screening, or even change your mind on the day of your scan.
'll be given a report of the scan which will tell you exactly how many weeks pregnant you are.
On the notes for the dr she put dates don't match not sure of viability of pregnancy.
Most mums-to-be, the first scan will be a dating scan at between 10 weeks and 13 weeks plus six days of pregnancy (nice 2008).
As part of your antenatal care, your midwife will offer a dating scan that will give you a more accurate date for the birth of your baby.
Your midwife may recommend an early scan at between six weeks and 10 weeks if you have experienced bleeding.
Your uterus (womb) is very deep in your pelvis, or if you're overweight, you may be offered a vaginal scan, which can get nearer to your baby.