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What's your Nicol's Rule EDD?

Posted by on Feb. 5, 2014 at 11:40 AM
  • 10 Replies

http://www.turningtidesmidwifery.com/duedate.php

^^ There's a calculator in the link!


What's one of the most common questions to hear when you're pregnant? "When are you due?" Most likely, your prenatal care provider gave you a specific day, which you circled on your calendar.

But like most questions about life and about children, the answer is usually more complicated than that.

Our language about due dates reflects our need for things to be on time. Even the baby is considered "early" or "late." We have such a social stigma around being late, but due dates are estimations, not deadlines. Most due dates (bills, library books) are deadlines, and we tend to project that framework onto birth. People who tell their family and friends a due date may have to endure 50 calls a day asking "is the baby here?" for an extra week.

But babies are not library books--no one's going to charge your baby an overdue fine. We'd prefer not to see babies come very early or late, but most babies come within a window of 2-3 weeks on either side of the due date--right on time.

How do they come up with these numbers, anyway?

Most doctors use Naegele's Rule, which is where we get the 40 week due date. Those fun little due date wheels usually follow Naegele's Rule. Problems with Naegele's Rule:

  • Naegele came up with the 40 weeks thing a long time ago without doing any research; he just noticed that it seemed to be about 10 lunar months, which is 280 days.
  • This calculation is based upon a 28-day cycle. Though this is the average, most of us have cycles that tend to be a little shorter or a little longer, which throws off the due date. And if your cycle is a lot shorter or a lot longer, your dates will be off even further.

The Wood's Method, sometimes called Nicol's Rule, is based on research and reflects the following important points:

  • mamas with cycles longer or shorter than 28 days do not ovulate on the 14th day, which means the whole pregnancy needs to be adjusted forward or back a bit for accuracy
  • first babies come a little later than those following
  • estimates that first babies come on average 41 weeks, 2 days; subsequent babies around 40 weeks, 5 days
by on Feb. 5, 2014 at 11:40 AM
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Replies (1-10):
sj3starz
by Bronze Member on Feb. 5, 2014 at 11:44 AM

Here's mine!

little.worthen
by on Feb. 5, 2014 at 11:50 AM

Right now, you are considered 7 weeks and 2 days pregnant.

According to the 280-Day Rule, your estimated due date would be:
September 20, 2014

According to Naegele's Rule, your estimated due date would be:
September 21, 2014

According to a modified Naegle's, adjusted for cycle length or known conception date, your estimated due date would be:
September 23, 2014

According to Wood's Method, your estimated due date would be:
September 28, 2014

StaciF
by on Feb. 5, 2014 at 11:50 AM
1 mom liked this

Mobile Photo

All about the same!
CutieCrab
by on Feb. 5, 2014 at 11:51 AM
1 mom liked this

 

Our "Best Guess" Due Date Calculator

Here are the results based on the information you provided:

Based on your LMP of November 24, 2013 and your average cycle length of 28 days, we can estimate that you likely conceived on or around December 09, 2013.

Right now, you are considered 10 weeks and 3 days pregnant.

According to the 280-Day Rule, your estimated due date would be:
August 31, 2014

According to Naegele's Rule, your estimated due date would be:
August 31, 2014

According to a modified Naegle's, adjusted for cycle length or known conception date, your estimated due date would be:
August 31, 2014

According to Wood's Method, your estimated due date would be:
September 06, 2014

 

sj3starz
by Bronze Member on Feb. 5, 2014 at 11:53 AM

Yours are pretty close together! :) What date have you been going by so far?

Quoting little.worthen:

Right now, you are considered 7 weeks and 2 days pregnant.

According to the 280-Day Rule, your estimated due date would be:
September 20, 2014

According to Naegele's Rule, your estimated due date would be:
September 21, 2014

According to a modified Naegle's, adjusted for cycle length or known conception date, your estimated due date would be:
September 23, 2014

According to Wood's Method, your estimated due date would be:
September 28, 2014


little.worthen
by on Feb. 5, 2014 at 11:56 AM
1 mom liked this
Sept 20th (=

Quoting sj3starz:

Yours are pretty close together! :) What date have you been going by so far?

Quoting little.worthen:

Right now, you are considered 7 weeks and 2 days pregnant.

According to the 280-Day Rule, your estimated due date would be:
September 20, 2014

According to Naegele's Rule, your estimated due date would be:
September 21, 2014

According to a modified Naegle's, adjusted for cycle length or known conception date, your estimated due date would be:
September 23, 2014

According to Wood's Method, your estimated due date would be:
September 28, 2014


aarensmommy
by Bronze Member on Feb. 5, 2014 at 3:56 PM

Our "Best Guess" Due Date Calculator

Here are the results based on the information you provided:

Based on your LMP of November 30, 2013 and your average cycle length of 31 days, we can estimate that you likely conceived on or around December 18, 2013.

Right now, you are considered 9 weeks and 1 days pregnant.

According to the 280-Day Rule, your estimated due date would be:
September 06, 2014

According to Naegele's Rule, your estimated due date would be:
September 06, 2014

According to a modified Naegle's, adjusted for cycle length or known conception date, your estimated due date would be:
September 09, 2014

According to Wood's Method, your estimated due date would be:
September 15, 2014



Rlambert6002
by on Feb. 5, 2014 at 3:56 PM

I had posted on the day I had my first u/s about the u/s dating me almost a week farther along. At the time I thought it impossible as I didn't remember dtd anytime the week before, nor did dh. but then we got to thinking and we both think there might have been a night....lol. Also, I typically have  28 day cycle, but occassionally have a 21 day cycle. If I were on a 21 dy cycle in Dec. and dtd the week before Christmas Eve then the Ovulation day would line up with my new due date. :)

Here is mine for a 28 days cycle:

Here are the results based on the information you provided:

Based on your LMP of December 09, 2013 and your average cycle length of 28 days, we can estimate that you likely conceived on or around December 24, 2013.

Right now, you are considered 8 weeks and 2 days pregnant.

According to the 280-Day Rule, your estimated due date would be:
September 15, 2014

According to Naegele's Rule, your estimated due date would be:
September 16, 2014

According to a modified Naegle's, adjusted for cycle length or known conception date, your estimated due date would be:
September 16, 2014

According to Wood's Method, your estimated due date would be:
September 21, 2014

And then for a 21 day cycle:

Here are the results based on the information you provided:

Based on your LMP of December 09, 2013 and your average cycle length of 21 days, we can estimate that you likely conceived on or around December 17, 2013.

Right now, you are considered 9 weeks and 2 days pregnant.

According to the 280-Day Rule, your estimated due date would be:
September 15, 2014

According to Naegele's Rule, your estimated due date would be:
September 16, 2014

According to a modified Naegle's, adjusted for cycle length or known conception date, your estimated due date would be:
September 09, 2014

According to Wood's Method, your estimated due date would be:
September 14, 2014

 

 

missbritt22
by Brittany on Feb. 5, 2014 at 4:15 PM

Mobile Photo

Here's mine but I know I conceived before the 8th so I'm not sure how accurate it is. I'm pretty sure I conceived around the 3rd or 4th...
Miss.Kristin
by Kristin on Feb. 5, 2014 at 4:22 PM

Here are the results based on the information you provided:

Based on your LMP of December 12, 2013 and your average cycle length of 35 days, we can estimate that you likely conceived on or around January 03, 2014.

Right now, you are considered 6 weeks and 6 days pregnant.

According to the 280-Day Rule, your estimated due date would be:
September 18, 2014

According to Naegele's Rule, your estimated due date would be:
September 19, 2014

According to a modified Naegle's, adjusted for cycle length or known conception date, your estimated due date would be:
September 26, 2014

According to Wood's Method, your estimated due date would be:
October 01, 2014

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