What due date calculation is more reliable?

Discussion in 'Pregnancy - First Trimester' started by Noodles, Apr 21, 2009.

  1. Noodles

    Noodles Mummy to two boys!

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    Would you to it from you LMP or your OV date (I was temping so I know it's right) as they both give me different due dates.
     
  2. Jemz3741

    Jemz3741 2 girls and a boy <3

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    I too was wondering this, will be interesting to find out. x
     
  3. booflebump

    booflebump Mummy to Toby

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    Doctors would normally go with the date from your last LMP, but if you can guarantee which day you conceived, they might take that day instead xxx
     
  4. JayDee

    JayDee Sunshine and rainbow

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    Doc last night just went on LMP, said they would be able to tell more accurately at the 12 week scan and even then it can be a few days either day.

    Not much help I know sorry!
     
  5. Dream.A.Dream

    Dream.A.Dream Mum to 6yo and WTT #2!

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    Just out of interest, do you ladies know if docs EDD take into account cycles longer than 28 days? xx
     
  6. polaris

    polaris Mother of two

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    Doctor's generally go by LMP but I am going by Ov date until my scan, cos I think it's more accurate. After my scan I guess I will go by my scan date.
     
  7. JayDee

    JayDee Sunshine and rainbow

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    She didn't with me....
     
  8. booflebump

    booflebump Mummy to Toby

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    They usually do - can make all the difference between being induced or having that extra day or two to go in to labour! xxxxx
     
  9. polaris

    polaris Mother of two

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    No it doesn't, that's why I'm going with Ov date until my scan. I think if you had a very very long cycle (like several months) then doctors would accept that LMP might not be accurate but if it's a 35 day cycle they don't care and just tell you the scan will give you a more accurate idea.
     
  10. cfenn

    cfenn mum to Theo & a bubble :)

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    with my last pregnancy my due date changed on my 12 week scan and i was put back 2 weeks - im presuming this was because my cycle isnt regular.

    this time my cycle has been bang on 6 weeks but the doc went off a usual 28day cycle making me due 6th dec - but iv worked out if i go for my 6 week cycle im due 20th dec - and even better if i work it out to the day i conceived its 31st dec!! im desperate to get my scan and know for sure cos theres a big diff between the 6th and the 31st!!!!! plus the 31st dec is my mums birthday!!!!

    roll on the dating scans for us all!! xx
     
  11. Dream.A.Dream

    Dream.A.Dream Mum to 6yo and WTT #2!

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    My cycle is usually 30 days and now on day 35. Going to pluck up the courage to test later. Already worked out when my EDD would be though if it is positive, would be Dec 25th! Am so nervous to test xx
     
  12. amerikiwi

    amerikiwi Mum of 2

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    My doctor went by Ov date. From temping, I know that I didn't Ov until CD24 (previously regular 26 day cycles!), so my LMP would have me a few weeks farther along than I actually am.
     
  13. polaris

    polaris Mother of two

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    Good luck testing later - hope you get good news!
     
  14. JayDee

    JayDee Sunshine and rainbow

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    Yeah - good luck Katy, hope you'll be joining us here soon.

    I think they only give you an estimate till the 12 week scan at which point they can be more accurate.

    Let us know how you get on x
     
  15. cfenn

    cfenn mum to Theo & a bubble :)

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    Good luck katy!! fingers crossed for you xx
     
  16. IrishBaby1109

    IrishBaby1109 Kian's PROUD Mommy

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    I have cycles longer than 28days and my doctor only discussed that meant when I ovulated wasn't considered "regular." It didn't affect my due date, my LMP was 1/24/09 and I'm due 11/12/09. When I went on 3/17/09 I was dated at 5weeks 5days. Hope that helps...
     
  17. MrsQ

    MrsQ Mummy to Mikey and bump

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    hey noodles sorry to butt into your thread but i may be joining you had a ?bfp today!!!

    and they do it 28 days past your lmp.
    xx
     
  18. Zeri

    Zeri Well-Known Member

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    Docs don't usually expect most women to know their O date (unless they're charting), so that's one of the reasons they tend to go by LMP only. I think O date is more accurate, though. LMP doesn't take into account the length of a woman's cycle - which often varies far from the average 28 days. If you ovulate 3 or 4 weeks into your cycle - say on CD24 or CD30, then to me, it would be more accurate to go by O date.
     
  19. lou1979

    lou1979 Mummy to 3 beautiful boys

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    I know i ovulated on the 12th and 13th of Feb yet when i had my scan at 8 weeks they put me forward 4 days!

    i have my 12 week scan tmrw, so will find out dates for sure then!
     
  20. AnotherMrs

    AnotherMrs #1 on the way!

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    I have irregular periods, so, they did a sonogram and measured the baby. That seemed to be pretty acurate, seeing as she gave us one of the days we tried to concieve... but we'll see in a few weeks!
     

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