1st Trimester

Due date differences...

What should you use, your estimation or the doctor's? I know I ovulated 6 days late based on OPKs, temps, and CM, but obviously my OB office goes by LMP. I know it's only 6 days difference, but I'm not sure whether we should use how far along I am based on my estimation or the due date given by the doctor (especially when we announce). For those of you who charted and know their O date was off from the normal, which date do you use?
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Re: Due date differences...

  • My ob goes off of LMP. Until I had my first u/s I was going off my ovulation date (by charting and OPK's) so 9/12. U/S showed a bigger baby so now my due date is 9/9.
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  • My midwife and fertility doc go off conception (aka ovulation).  6 days is a large enough difference for me to be willing to argue the point.  Show them your charts and why you know your due date.  Plus then the US will match up without the tech or doctor telling you something scary and untrue like "baby is measuring behind."  Duh, cause they didn't even exist when your doctor is saying they did.  They appeared 6 days later!
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  • Before your first u/s the doctor will go by LMP.  The u/s could show that neither of you is right on the money because even if you know the date of ovulation, that doesn't definitively tell you when conception occurred.  Do you know when you're getting your first u/s?  
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  • I was only one day different. but I would go by my O date for telling people. once an ultrasound is done, they hopefully will change it to the ovulation date lol
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  • I would go by O date in your shoes. Try to get your doctor to change it too if he doesnt after the first ultrasound. 6 days is almost a week and tons can happen in just one week of pregnancy. I have irregular cycles so my doctor never went by my LMP but the dating us was really close to my charting. I measured a day ahead of where I thought thoughI know I couldnt have conceived that day since we ddidn't have sex until the day after. One day difference doesn't matter as much as 6 days, imo.
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  • I would use your estimation since it is most accurate.  Also, I think it's better to go by the later due date anyway (more accurate or not).  I've heard from other moms that around your due date, people will call you constantly and bug you about whether or not you had the baby yet.  Plus, a lot of doctors try to push women into inducing labor if the baby hasn't arrived by the due date (which is ridiculous!).  Picking the later due date (which also seems to be the more accurate date anyway) will give you a few more days to avoid those pesky family members and paranoid OBs. 

    Each time you get an ultrasound, they will re-estimate your due date anyway.  I knew I ovulated a few days early and they changed my due date from early Sept to late August.  I asked my midwife to keep my original due date (based on my LMP) in my chart for the reason above and I tell everyone the baby is due in Sept.
  • I had a dating u/s so I use that. If I hadn't had that I would've gone with the date based on my charting.
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  • Honestly I'm not sure that it matters.  I did IVF with my first pregnancy and based on the exact dates in which everything went down my due date was Aug 23rd.  When I was released from my RE to my OBGYN she did a dating u/s and moved my date based on the size of the baby to Aug 27th (which I thought was so dumb because I knew exaclty when I conceived because of IVF).  Well the little turkey didn't arrive until Sept 1st after 14 hrs of an induced labor so who was right?  :)

    I did IVF iwth this pregnancy too and she did not do a dating u/s this time so my due date didn't change.  She seems a lot more laid back about this one.  Not sure why. 

  • My office doesn't do an us until 20 weeks. Last time I was 6 days ahead in my us and they never changed my due date because I used a midwife and didn't want to jump to induction if I did end up going late and my son was born 6 days early lol. So maybe the us will tell all lol
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