1st Trimester

LMP & O date

If you KNOW when you ovulated because you were charting, will your doctor likely use your O date to determine due date or will s/he still use your LMP?  I went 26 days until I Oed so I feel like my date will be really "off" if s/he uses my LMP.  Does it matter that much?

  • DD1: August 2009
  • DD2: December 2010
  • DS: August 2012
  • M/C 9/2013, 12/2013 
  • DD3: October 2014 - April 2015 Miss you baby girl.
  • Current Due date:  April 14, 2016
Musings of a Farmer's Wife

Re: LMP & O date

  • Yes, it matters quite a bit because your dates can make you look like you are not having a healthy pg if you O late.  My LMP has me at 6 weeks today, but my O date has me at 5 weeks.  My doctor is doing everything off of my LMP date -- but will adjust later when they can date me with an u/s.
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  • My dr. went off my LMP, even though I told the nurse the date I O'd. They then used the measurements from the 1st u/s.
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  • yes, it matters- make sure you let them know of your O date if your fairly certain of it. my first doc didn't listen, and when i went in for first appt and they did an u/s and she seemed a little concerned because the sac was so small... it was measuring small because i was only 6wks and she had me at 8wks.
  • Yes, your Dr. should use your O date if you are certain of it.  I o'd on CD35, so it would be really, really off if she didn't.
  • Same as PPs-- they will be able to date everything with an u/s
  • I am going in for an ultrasound next week because I don't know when I O'ed and based off my LMP it would be way off. They plan to take the date from the ultrasound and use that for my EDD.

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  • Okay ladies!  Thank you so much!

    • DD1: August 2009
    • DD2: December 2010
    • DS: August 2012
    • M/C 9/2013, 12/2013 
    • DD3: October 2014 - April 2015 Miss you baby girl.
    • Current Due date:  April 14, 2016
    Musings of a Farmer's Wife
  • I told my doc my O date, but he didn't seem to care. He still used my LPM. I am pretty regular though, so my calculation based on my O date is only two day off from what he told me, so for me it's no big deal.
  • I told my dr my O date but she didn't care and still based it on my LMP. It was 4 days off. She also looked at my U/S but still used the LMP. If it is only a few days off, it probably doesn't matter, as many women don't know their O date so it seems to be common to be a few days off.
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  • On both my last PGs I knew exactly when I O'd and when my Due date was. The doctor in my GP office and in the hospitals refused to use the dates I gave and went by LMP.
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    L-R: Liam (7), Eimhin (6) and Fionn (4)!  (Irish names)
    Too busy to update the pics for now ... :)

  • My dr. explained it the same way as all of the sites I read on the internet and in books. Since some people can't pinpoint the exact date they O'd, they use the date of your LMP to be consistent. It confused me as well because I'm 99% sure of when I O'd and when I conceived, and it wasn't the date of my LMP, but the dr. said it didn't matter.

    I guess if you are way off, they will adjust when you have your u/s, but only if it's more than a few weeks. I'm 7 weeks along, but I know the baby is only 5 weeks old. But, my dr. still considers me 7 weeks for due date purposes.



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  • better late than never, right?

     

    I Oed on CD 27, and they use a 28day cycle to Estimate due dates. I KNEW they were way off. But would they listen? NOPE! So DEFINTELY tell your doctor if you think you O'ed way off from "normal" (cd 14). They gave me an EDD of June 30. My EDD is July 12. And who was right?!

     

    Me! 

     (had to have an u/s to confirm my dates).

     

    GL!

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