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how is due date calculated?

i wasnt sure of my last period and told me my due date was dec 22. and they did an utrasound and kept the due date the same. so does that mean they figured it out or they are going by my last period even though im not sure of it.

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mauricellaf

Asked by mauricellaf at 7:22 PM on Oct. 21, 2010 in Pregnancy

Level 15 (2,240 Credits)
Answers (5)
  • Usually they go off the first day of your last period. If you're not sure, they will determine a due date (and keep in mind, due dates are ALWAYS an estimation, not set in stone) based on the measurements they find through an ultrasound...
    Anouck

    Answer by Anouck at 7:25 PM on Oct. 21, 2010

  • Nine months and one week added to the first day of your LMP.
    2autisticsmom

    Answer by 2autisticsmom at 7:28 PM on Oct. 21, 2010

  • musicmom08

    Answer by musicmom08 at 7:29 PM on Oct. 21, 2010

  • You can go to babycentre.com and the have a due date calculator.
    Amanda_82

    Answer by Amanda_82 at 8:42 PM on Oct. 21, 2010

  • if you arent sure of your lmp they do an ultrasound and base the due date on the baby's measurements
    lovebunny82709

    Answer by lovebunny82709 at 3:29 AM on Oct. 22, 2010

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