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#1 of 23 Old 05-07-2011, 01:39 PM - Thread Starter
 
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The 1st day of my last period was April 6th, when I put that into EDD calculators I get a due date of January 11th and I am 4.5 weeks along.  But then I see other people saying they are due right around then and are 5.5 weeks?  I am so confused.... and yes, I should get this stuff after 3 kids :P


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#2 of 23 Old 05-07-2011, 03:12 PM
 
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I'm due January 6th and today I'm 5 weeks 1 day pregnant. My last "period" (it was really still part of a miscarriage because I was still testing +)  was April 1st but my due date is based on ovulation (April 15th). 

 

I bet some are basing their due dates on the first day of their last period and others on ovulation! 


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#3 of 23 Old 05-07-2011, 04:41 PM
 
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I think that you are right on. My last period was Apr 6th too, so my EDD would be Jan 11 (if I ever find out if I am preggo...argghh..). At least that is what the EDD calculators say. Like the PP said, some people calculate by LMP or conception date. Everyone has different length of cycles and the EDD is not usually right on. I know that I have babies at 42 weeks, not 40.


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#4 of 23 Old 05-07-2011, 04:49 PM
 
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Quote:
Originally Posted by asprague View Post

I think that you are right on. My last period was Apr 6th too, so my EDD would be Jan 11 (if I ever find out if I am preggo...argghh..). At least that is what the EDD calculators say. Like the PP said, some people calculate by LMP or conception date. Everyone has different length of cycles and the EDD is not usually right on. I know that I have babies at 42 weeks, not 40.


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#5 of 23 Old 05-07-2011, 04:51 PM
 
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well now I'm confused...I just used this calculator based on conception and it said: Congratulations! Your estimated due date is Friday, January 06, 2012, which means you're in week 6 day 1 of your pregnancy. 

 

Hmm.....maybe it's the IN my sixth week thing that's important even though I'm 5 weeks 1 day along. Clear as mud? 


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#6 of 23 Old 05-07-2011, 05:11 PM
 
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Ok that calender, the what to expect is just off. I its telling me I am in week 6 day 5 of my pregnancy when I know for a fact with out doubt that I am in week 5 day 4.


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#7 of 23 Old 05-07-2011, 05:26 PM
 
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http://www.babymed.com/pregnancy-calendar-and-calculator-week-by-week 

 

this calculator is pretty cool!


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#8 of 23 Old 05-07-2011, 09:49 PM - Thread Starter
 
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I know EDD is jsut an estimate of course but anyone due on a certain day should be the same amount along as anyone else due on that day... ya know?


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#9 of 23 Old 05-08-2011, 08:03 AM
 
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an EDD of 1/11/12 would be 4w4d along today

 

I am 5w6d and I am due January 2nd.


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#10 of 23 Old 05-09-2011, 05:06 PM
 
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Here's another good calculator, by conception or by LMP.  It tells you how far along you are now, and when each trimester starts/ends.  The what to expect one is confusing.

 

http://www.justmommies.com/duedate.shtml


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#11 of 23 Old 05-10-2011, 05:41 PM
 
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Now I am confused too! First day of my last period was also April 6th, and midwife said my due date is January 15th! Hmm....Oh, and too funny that so many of us started on the same day, lol


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#12 of 23 Old 05-10-2011, 06:16 PM
 
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Quote:

Originally Posted by Celticqueen View Post

Now I am confused too! First day of my last period was also April 6th, and midwife said my due date is January 15th! Hmm....Oh, and too funny that so many of us started on the same day, lol



If they ask your LMP to calculate by that, they may also take into account your normal cycle length if you know it.  Obviously, the whole thing would make a lot more sense if all of us were taught to know when we ovulate and the docs used that information, instead of using the LMP and generally assuming all of us ovulate on day 14 of every cycle. 

 

Also, when I was preg with DS, the midwife said she had 2 different wheels to calcuate due date (based on ovulation) and one said I was due one day later than the other.  Must be a brand thing?  Go figure.  Not that one day matters, but it doesn't make sense.

 

We, the MW and I, chose to use the later date on paper.  This was important, bc if their patients go past 42 weeks, they have to induce or transfer to the OB, so one day can make a difference with that.  (A friend's OB induced automatically at 40w exactly if you hadn't delivered on your own!)  So if you have a choice of more than one due date, I would always choose the *later* one officially to give yourself more time to avoid automatic interventions.

 

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#13 of 23 Old 05-12-2011, 07:35 PM
 
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I am confused too...because on the calendars posted I am anywhere from 3 w to 5.5 w? Because my cycle length changes each month....can be 45 days or 21 days...I know I ovulated about 2.5 -3 weeks ago though...but I didn;t record the exact date this time. I ahd been using homeopathics from my homeopatht hat made me ovulate much earlier than usual...and my luteual phase is usually only like 9-11 days but I was using vitex for two cycles and am assuminh since this bean stuck it was longer this cycle....confusing!!!

ETA: 1st day of LMP was april 8th and I believe it was a very early m/c and I bled over ten days...but seemed to have ewcm much earlier and think I o'd by the 22? ahh!


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#14 of 23 Old 05-13-2011, 09:39 AM
 
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Both for LMP of 4/08/11 and O date of 4/22/11, your EDD is 1/12/12 and today you are 5w0d


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#15 of 23 Old 05-13-2011, 11:56 AM
 
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thanks...different calculators were giving me different numbers...I am not 100% on the o date...


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#16 of 23 Old 05-20-2011, 12:25 PM
 
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Im having problems too, figuring out theh EDD. It doesnt really matter that much to me and all the calculators are saying either 1/25 or 2/1. I just want to know which DDC to sign up for smile.gif

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#17 of 23 Old 06-13-2011, 12:53 AM
 
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EDD is confusing. It depends partially on what method of calculation you use, too. Using the standard ones (which use Naegle's rule, which is WRONG, & which is sadly the ones the drs use) my due date is January 6th or 7th. Using Mittendorf-Williams, which is much more accurate, I'm due January 16 or 17. Using Naelge with ds3, my due date was Feb 27. Using Mittendorf-Williams, it was March 1. Ds3 was born March 3. I'm going with the Mittendorf date.

 

It's really easy to calculate for yourself. Count back 3 months from your LMP date. Add 10 days if you've had a baby already or you aren't Caucasion. Add 15 days if it's your first baby & you are Caucasion. I find it's easiest to look at a calendar to do it.

 

If you don't know the history, Naegle's rule is from the 1830's years ago & used a sample of just 34 women. Mittendorf-Williams is from the 90's and used a much bigger sample.

 

http://chronicle.uchicago.edu/961107/pregnancy.shtml

Quote:
A retrospective study by Mittendorf and colleagues (Obstetrics and Gynecology, 1990; Vol. 75) determined that white women with single-birth pregnancies receiving private care averaged seven days longer gestation than Naegele's Rule predicts. A second study by Mittendorf (American Journal of Obstetrics and Gynecology, 1993, Vol. 168) concluded that there are several factors -- including number of previous births, age and race -- that can be used to determine the length of pregnancy more accurately than Naegele's Rule, which does not take other factors into consideration.

Few women deliver exactly on their due date. A prospective study comparing Naegele's Rule with the Mittendorf-Williams Rule(TM) found the latter to be twice as accurate as Naegele's Rule in predicting gestation.

 

Sorry, I'm kind of interested in due dates. So many unnecessary interventions could be avoided if drs used a more accurate dating method. I have no idea why they don't..probably because pharmaceutical companies don't make wheels using anything but Naegle's.


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#18 of 23 Old 06-13-2011, 08:25 AM
 
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This is really interesting. I've never heard of this. It is very close to my edd...it givesme the 18th jan and my edd is the 13/14th jan...how does this factor in u/s dating? my early us said jan 14th, my edd by lmp is the 13th....this gives me the 18th, dd1 was born feb 19th, due feb 6...
 

Quote:
Originally Posted by Devaskyla View Post

EDD is confusing. It depends partially on what method of calculation you use, too. Using the standard ones (which use Naegle's rule, which is WRONG, & which is sadly the ones the drs use) my due date is January 6th or 7th. Using Mittendorf-Williams, which is much more accurate, I'm due January 16 or 17. Using Naelge with ds3, my due date was Feb 27. Using Mittendorf-Williams, it was March 1. Ds3 was born March 3. I'm going with the Mittendorf date.

 

It's really easy to calculate for yourself. Count back 3 months from your LMP date. Add 10 days if you've had a baby already or you aren't Caucasion. Add 15 days if it's your first baby & you are Caucasion. I find it's easiest to look at a calendar to do it.

 

If you don't know the history, Naegle's rule is from the 1830's years ago & used a sample of just 34 women. Mittendorf-Williams is from the 90's and used a much bigger sample.

 

http://chronicle.uchicago.edu/961107/pregnancy.shtml

 

Sorry, I'm kind of interested in due dates. So many unnecessary interventions could be avoided if drs used a more accurate dating method. I have no idea why they don't..probably because pharmaceutical companies don't make wheels using anything but Naegle's.



 


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#19 of 23 Old 06-13-2011, 01:35 PM
 
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Well, even though early ultrasounds are the most accurate ultrasound for dating, they can still be off by a week or 2. I know women whose husbands weren't even around when the ultrasound said they must have gotten pregnant. All it takes is the tech being off by a millimetre or 2 to make a big dating difference.

Personally, I go with the latest dating I can. It's always going to be a guessing game, but the later the date, the less pressure there is to induce andthe less risk of iatrogenic prematurity. If I had a provider, I'd figure out the latest due date for me & figure out what LMP to tell based on that date, so it works on their little wheel. As far as I'm concerned, I'm correcting for their non evidence based issues.

Since you've had a dating ultrasound, I'd just keep the later date in mind if you go "over". It might help to resist interventions, knowing that you could actually be due a bit later than they think.

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#20 of 23 Old 06-13-2011, 08:55 PM
 
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I'm so torn by the due date. On the one hand, I want a later date to avoid any unnecessary interventions or stress. On the other hand, my maternity leave is based on my due date - I get to go out on leave 4 weeks before my due date. I think I will stick with the earlier date and argue against any intervention later if I need to. I'm really looking forward to some time off work to spend with dd before the baby comes.
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#21 of 23 Old 06-14-2011, 10:43 AM
 
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I had such an issue with this my last pregnancy!  The due date calculators gave me one date and my doctor gave me another.  It turned out that both "thought" they were giving me a due date based on a gestation of 280 days (a calculated average gestation from LMP to spontaneous labor that doesn't take other factors into account, such as previous deliveries), but the doctor's office was using a manually read circular chart.  The nurse didn't have it lined up quite right (my doctor noticed that when I asked), and it was a leap year, which the chart didn't account for.  So after many months of fretting and looking this up, including all the due date calculation methods, I finally explained the two-day discrepancy! 

 

I don't really care what my official due date is.  I knew even with my first that she would be very late because my family takes longer than average to gestate babies (my aunt even had twins a week late, and they have an older sister!).  But it was interesting to learn about different ways of calculating and satisfying to solve the mystery of why my EDDs were off even when they were using the same method to calculate it.  Now my doctor's office uses a computer and I have just one EDD, which my doctor and I know is most likely quite a bit earlier than I will actually deliver.

 

--Dana

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#22 of 23 Old 06-14-2011, 01:51 PM
 
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Quote:
Originally Posted by Kindermama View Post

well now I'm confused...I just used this calculator based on conception and it said: Congratulations! Your estimated due date is Friday, January 06, 2012, which means you're in week 6 day 1 of your pregnancy. 

 

Hmm.....maybe it's the IN my sixth week thing that's important even though I'm 5 weeks 1 day along. Clear as mud? 



this one tells me i'm a week ahead of where i thought i was, too. lol.


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#23 of 23 Old 06-15-2011, 11:39 AM
 
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Quote:
Originally Posted by Mommyofalmost6 View Post

http://www.babymed.com/pregnancy-calendar-and-calculator-week-by-week 

 

this calculator is pretty cool!



This calculator helped! Now I know where I stand.  9 weeks since last MP, but really about 8 weeks pregnant because of long cycle.  Thanks!


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