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hi question is about lmp, u/s and conception


Forum: Pregnancy Questions

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  #1  
July 15th, 2013, 11:51 PM
laceyg's Avatar Member
Join Date: Jan 2013
Posts: 37
Hi just wondering do you find ultrasounds more accurate with conception dates than lmp?
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  #2  
July 16th, 2013, 05:30 AM
Urchin's Avatar Loving every minute.
Join Date: Sep 2009
Location: Atlantic Canada
Posts: 7,921
An early ultrasound can be very accurate in dating.

However, if you know when you ovulated, and your cycle length you can be nearly perfect in figuring out conception.

Using JUST your last menstrual period can be misleading. This is because it's based off of a standard 28-day cycle with ovulation happening at cycle day 14...which many women do not follow.
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  #3  
July 16th, 2013, 06:28 AM
Pretty Crispy's Avatar Proud Momma
Join Date: Jul 2012
Location: USA
Posts: 2,634
Early ultrasounds can be very accurate, much more so than using lmp. Charting is pretty accurate as well.
Based off my lmp I would have had an edd of 4/1 but I was charting and knew my ovulation was later. Us confirmed this and my edd was pushed a week later. Ds still was almost 2 weeks overdue. Had we used my lmp I would have been pushed to induce at over 42 weeks when in fact it would have only been 41 weeks.
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