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  1. #1
    KrystalS is offline Sapphire level (2000+ posts)
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    Default Changing due date?

    I had my 20 wk u/s today and the tech said she thinks my due date is wrong. This was my first u/s I never had one to determine due date. My original due date was just picked due to the date of my last period. The tech said it is up to the doctor to change my due date. My original was Oct 30th, tech said it should be Oct 19th and she was sure. Do doctors normally change due dates according to u/s?
    -Krystal

    DD 2/04
    DS 10/5/10

  2. #2
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    They can and do. Your doctor should discuss all the results of your u/s at your next appointment.

    Beth

  3. #3
    wellyes's Avatar
    wellyes is offline Blue Diamond level (20,000+ posts)
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    Yes, the U/S is more reliable than the date of your last period.
    Congratulations on 11 fewer days to go!
    DD - 8
    DS - 5

  4. #4
    swissair81 is offline Diamond level (5000+ posts)
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    They usually only change due dates based on first trimester ultrasounds. They are most accurate up to 10 or so weeks. They also correlate it with when you feel fetal movement, whether your fundus (top of uterus) is at your umbilicus @ 20 weeks & other milestones. I've had my due date changed 3 times (current pregnancy & with my 2 younger children). Always backwards. This time they moved my due date back by 9 days. Since we've started doing dating u/s, I am basically never overdue. I was 2 days overdue with my first, who was only dated by LMP. She also measured as small for gestational age. It's a pity I can't do a retroactive dating u/s, because I bet she was just fine.

  5. #5
    KrisM is offline Clean Sweep forum moderator
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    Ultrasounds are more accurate earlier on. But, they can change your date. Personally, if I knew my last period and knew that I had regular 28 day or so cycles, I would be arguing a 11 day change. I'd be worried about it being wrong and then pushed into everything too early.
    Kris

  6. #6
    SnuggleBuggles is offline Black Diamond level (25,000+ posts)
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    After the 1st trimester the accuracy of u/s goes down to about +/-14 days. I donnt know if iI would feel comfortable with a date change. And I would be very, very hesitant to evict baby before the onset of labor (no inductions or c-sections before 40 w, for sure, if all is well).

    Beth

  7. #7
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    Yes, our U/S tech suggested we were about a week further along than we thought. That's not much of a change, so I'm trying not to get my hopes up. I'm mentally sticking with the original date, and if he comes early, he comes early.

  8. #8
    ohiomom1121 is offline Sapphire level (2000+ posts)
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    My doc changed mine by 9 days because of an early ultrasound...and the 18 week ultrasound doctor agreed that it was correct.

  9. #9
    sunnyside is offline Sapphire level (2000+ posts)
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    Mine was also moved up 6 days, even though I KNOW my conception date. I'm sticking with my date even though my OB says it's 6 days earlier.
    Mama to two sweet girls - Summer 2010 and Spring 2015

  10. #10
    ebjw is offline Silver level (200+ posts)
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    Mine was moved back both times based on a first trimester ultrasound. My doctor said they won't change it after the first trimester. Maybe some doctors do though. See what yours says.

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