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March 2013 Moms
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Dating a pregnancy according to LMP or O?

cgator14cgator14 member
in March 2013 Moms

Hey girls,

I know most OBs calculate EDD according to LMP but has anyone heard of them dating a pregnancy according to O date if you were charting? For me it wouldn't make a big difference but I was just curious! TIA! 

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Re: Dating a pregnancy according to LMP or O?

  • luvsdogs2luvsdogs2 member

    I just went in yesterday for my confirmation appointment.  Even though I was charting and taking OPK's and could tell them when I ovulated, they insisted on going by LMP.  After just coming off a loss, I was quite insistent that they at least acknowledge in my chart that I have long cycles and ovulated 5-6 days after a "normal" 28 day cycle.  My big fear is going for that first u/s and them being like "uh-oh, you're almost a week behind".  So they at least put it in my chart.  And in my head my due date is 3/10/13.  But for now I'll go by their stupid LMP due date Stick out tongue  

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  • ebp913ebp913 member

    Last time around they wanted my due date a week before I knew it was because I ovulate late.  I insisted that I knew the right date and they changed it. 

    Your first dating ultrasound will likely confirm what you think though and they will change it.  A few days won't be a big deal but a week is a big deal so just wait it out and see what they say at your first ultrasound. 

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  • 00jennifer0000jennifer00 member
    If you know your O date, just count 14 days back and give them that for you LMP.  That's what I do.  My O date is usually around cd13, but this time it was cd18, so that's kind of a big deal to my neurotic brain.
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  • luvsdogs2luvsdogs2 member

    image00jennifer00:
    If you know your O date, just count 14 days back and give them that for you LMP.  That's what I do.  My O date is usually around cd13, but this time it was cd18, so that's kind of a big deal to my neurotic brain.

    Dang it!  Why didn't I think of that!  Grrr, too late now. 

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  • littleusfamilylittleusfamily member
    I think they're going to do LMP even though I know my O date. It's only a two day difference though so I'm not too concerned!
      
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  • SpecialOrder2013SpecialOrder2013

    Oh...that would have been helpful to know.  I didn't O until CD33 this cycle so it's going to be pretty far off if they go by LMP!

    ETA: My ticker represents what I believe to be more accurate (using the count back by 14DPO trick) 

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  • greenMama79greenMama79
    They go by LMP, and then they go by growth with ultrasound too
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  • sucrets4sucrets4 member
    I go by O and base my ticker on that.  They go by LMP, but really by the first dating u/s which is pretty accurate.  With DD, I o'd late and the u/s was exactly what my chart said.  If I hadn't been charting I would have worried that the baby was measuring 1.5/2 weeks behind.  Knowledge is power!
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