(Closed) EDD – LMP vs OD: How accurate was your due date/birth date?

posted 3 years ago in Pregnancy
Post # 2
3092 posts
Sugar bee

Very accurate, like within a few days before what I was told for each due date.

Post # 3
9815 posts
Buzzing Beekeeper
  • Wedding: September 2013

Your O date should be more accurate.  I happened to have O’d on day 14 the cycle I got pregnant but if I had O’d a few days later (normal for me was CD 15 or 16) I would have lied about my LMP by 2 days so my EDD would be accurate.  It shouldn’t matter except when it comes to being induced and I was already induced once so I’d like to avoid it.  Dr’s will go by your LMP unless you’ve had an ultrasound far enough off from that so they have reason to change the dates. 

Post # 4
2554 posts
Sugar bee
  • Wedding: June 2012

Using LMP assumes a 28 days cycle and day 14 O date which is not the case for many women. 

With my first pregnancy I never had a dating ultrasound. LMP put me at April 16th, O date at April 22nd. Birth date was 2 May!

This pregnancy I did have a dating ultrasound. LMP put me at June 17th, O date at June 21st and ultrasound at June 23rd. I’ve yet to see how this one turns out! ☺

Post # 5
2021 posts
Buzzing bee
  • Wedding: September 2013

My ovulation date based off temping and OpK was Jan 27, I had him 2 weeks early on Jan 15.

Post # 6
4133 posts
Honey bee
  • Wedding: August 2013

LMP had Aug 5. Ovulation had Aug 10. Had her July 13 so very early (and no issues at  all). 

Post # 7
178 posts
Blushing bee
  • Wedding: November 1999

LMP put me in Jan 25, ovulation and dating ultrasound Jan 24. I was induced on Feb 8, when I was 42+1 weeks pregnant and Dear Daughter was finally born via Caesarean the next day.

Post # 8
197 posts
Blushing bee
  • Wedding: May 2015

EDD based on LMP was Sept 20. Based on O date was Sept 18. At my dating ultrasound they moved my EDD to Sept 13. He was born Sept 5.

Post # 9
2902 posts
Sugar bee
  • Wedding: June 2013

My EDD based on LMP would have been April 1, but I was charting and knew I ovulated on CD 21 so my real EDD was April 7. Early ultrasounds showed me measuring right on target for April 7. 

ETA: And I was induced at 37 weeks, so he was born at 37w3d and perfectly healthy on March 20.

  • This reply was modified 3 years, 6 months ago by  KatieBklyn.
Post # 10
733 posts
Busy bee

It’s become standard now to do a very early ultrasound to determine a more accurate due date. Those are extremely accurate. Did you have one?

Post # 11
605 posts
Busy bee
  • Wedding: September 2012

My lmp due date would’ve been April 23, May 2 by o date. Dating ultrasound gave me a due date of May 3. She was born April 30. 

Post # 12
887 posts
Busy bee
  • Wedding: February 2012

Mine would have been WAAAAY off if we went by LMP because I have aggrivatingly long cycles. LMP put me at EDD of 11/6. Based on ovulation, and confirmed by dating u/s my EDD was 11/18. He was born on 11/11 (39 weeks). 

Post # 13
663 posts
Busy bee
  • Wedding: June 2014

My due date based on ovulation was 10/4, based on LMP it would have been 9/29. I gave birth on 10/1.

Post # 14
41 posts

With my first I gave birth the day after my due date.

With my second it was 2 days after.

With my third who knows 🙂 only a couple months left!

The topic ‘EDD – LMP vs OD: How accurate was your due date/birth date?’ is closed to new replies.

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