Early ultrasounds...

philosurfer · Apr 13th, 2012, 10:24 AM

If you get an early dating ultrasound, would it be more than two weeks off? It's not matching my lmp at all and it's dating it about three weeks further...

petitpas · Apr 14th, 2012, 06:18 AM

Hi philo, unless you were tracking your ovulation yes, your first scan can be miles off from your LMP date.
LMP is just a theoretical date that is used until more info is available by scan. I say theoretical because it is assuming an average woman's ovulation happens on day 14. As I am sure you are aware, we are far from average with our cycles so quite often it is wrong.
The best thing is to have another scan a week or two after your first and then see whether the measurement matches the first scan's. If it does, then your baby is growing perfectly on target and you adopt the scan's dating as the official age of your baby.

taylorxx · Apr 17th, 2012, 00:15 AM

WSS^^^ Are your periods irregular? If so that is probably why baby is measuring ahead! I would go back in a week or two to get another ultrasound

How far along was baby measuring? Congratulations xx

Apr 13th, 2012, 10:24 AM	#1
philosurfer Pregnant (Expecting) New BnB member Join Date: Apr 2012 Posts: 1	Early ultrasounds... If you get an early dating ultrasound, would it be more than two weeks off? It's not matching my lmp at all and it's dating it about three weeks further...

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Apr 14th, 2012, 06:18 AM	#2
petitpas Other BnB Elite Join Date: Dec 2009 Posts: 14,700	Hi philo, unless you were tracking your ovulation yes, your first scan can be miles off from your LMP date. LMP is just a theoretical date that is used until more info is available by scan. I say theoretical because it is assuming an average woman's ovulation happens on day 14. As I am sure you are aware, we are far from average with our cycles so quite often it is wrong. The best thing is to have another scan a week or two after your first and then see whether the measurement matches the first scan's. If it does, then your baby is growing perfectly on target and you adopt the scan's dating as the official age of your baby.

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Apr 17th, 2012, 00:15 AM	#3
taylorxx Pregnant (Expecting) BnB Addict Join Date: Feb 2011 Location: US Posts: 5,312	WSS^^^ Are your periods irregular? If so that is probably why baby is measuring ahead! I would go back in a week or two to get another ultrasound How far along was baby measuring? Congratulations xx

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