How accurate are dating scans at 9 weeks

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If you have miscarried a previous pregnancy or you have experienced some level of vaginal bleeding over the last nine weeks, you may also be offered an ultrasound. This scan can confirm whether your pregnancy is progressing healthily. This ultrasound may be conducted vaginally or externally on your abdomen. Know that if your healthcare professional has officially referred you for an early scan Medicare will cover it.

Bring some tissues with you; this can be a very emotional moment. If your ultrasound shows that your baby is growing slowly, or has a lower than average heartbeat your chances of miscarrying are high. If you have been experiencing pain or vaginal bleeding, you might be somewhat prepared for this news. However, no matter how prepared you think you may be, hearing your miscarriage suspicions confirmed is likely to be a distressing experience.

At nine weeks, your baby will measure approximately 2.

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The foetus will resemble a green olive and weigh less than 2 grams. Join Huggies now to receive week by week pregnancy newsletters. Pregnancy Week by Week Take a look at each week of your pregnancy, from conception to birth, with our comprehensive email newsletters. You'll need to activate to enter promotions - find out more. Didn't get the email? What best describes you? I'm trying to conceive I'm having a baby I'm a parent I'm a carer. It just doesn't quite add up by my reckoning of when I think I ovulated and when I know we did the deed!

Dating scan accuracy?!

Unless you have an early pregnancy scan most of you will be given your estimated due date at the week scan. Of course you have probably already used an online due date calculator.

This is where you discover that your due date isn't based on the date you conceived, it's actually calculated from when your last menstrual period started your LMP. It's because it gives a definite date for health professionals to work with. There would be so many variables if it was calculated from when you think you conceived, especially as everyone's cycles are different and the fact that you don't necessarily conceive on the day you have sex!

But this will only give you a rough idea.

Dating your Pregnancy | The MotHERS Program™

This is especially true if you have an irregular cycle or have been on the Pill for example. Experts say that the scan date can sometimes come out as less pregnant than suggested by your LMP. But then again with my first baby I was spot on with dates, he always measured big and he was a week overdue Babies are ready when they're ready - try not to worry easier said than done. But Nigel also says that the estimated and that is all it is date is normally accurate plus or minus about a week.


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The healthcare professionals will stick to this date as far as possible because it is then used as the baseline for growth throughout pregnancy. Your baby's growth can slow down and then have spurts. I've not even had my 20 week scan yet. I have scans every few weeks so it will probably keep on changing.

My baby will come when it's ready anyway, maybe weeks before or maybe weeks after my due date. These can be carried out from week 5 or 6 of pregnancy, which is a notoriously tricky time to be accurate on dates. Measurements at such an early stage aren't accurate which is why they wait for 12 weeks to date you. Expert Jan Steward, who is director of Ultrasound Direct and Babybond, agrees that early scans carry a much greater risk of inaccuracy.

What to expect during your 9 week ultrasound

We always recommend mums get a definitive dating scan closer to 12 weeks as this will be much more accurate. Just half a millimetre at such an early stage can change your date by a week. Your week scan will be far more accurate. The sonographer then said that I was only about 4. Then at the week scan I got an EDD of 15 march, so that early scan was completely out. Well, you'd think so, wouldn't you. At around 12 weeks you can get more accurate measurements.