Pregnancy dating scan wrong

Before the advent of routine ultrasound in pregnancy, medical personnel estimated a baby’s due date by the date of the last menstrual period and by feeling the uterus and determining the size to see if it matched the given due date.

With transvaginal ultrasound, checking for embryonic development known to occur within a certain time frame more accurately dates a pregnancy.

I had to drink so much bloody water before my scan only to find there was a delay before my appointment – I felt like I was going to explode.

I'll never forget one nurse asking me, 'Do you think you could just pop to the loo and let just a little bit out? ’ When it comes to the actual scan you'll lie on your back and then some sticky, clear gel will be rubbed over your abdomen.

It records high-frequency sound waves that create an image (see Reference 4).

Normally, ultrasounds before until week 4 of pregnancy shows nothing in the uterus and serve no purpose.

Drink 0.5 Ltr (1 pint) clear fluid approx 1 hour before appointment time.

If the difference between the two is less than a week apart, she’ll generally go with the date calculated from your last period.NICE recommends it's done between 10 weeks and 13 weeks.You will have had earlier appointments and may have had an early scan if you've had any concerns such as bleeding, but otherwise this is the first time you'll get to see your baby, so it's a real milestone in your pregnancy.Most clinics can comfortably accommodate 5 guests including children for this scan.If you would like to bring more, please contact your chosen clinic when booking to check how many we can accommodate.