How are you calculating weeks? - Mothering Forums

Forum Jump: 
 
Thread Tools
#1 of 22 Old 10-06-2008, 08:52 PM - Thread Starter
 
Devaskyla's Avatar
 
Join Date: Oct 2003
Location: in my great new home
Posts: 4,596
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I'm just curious, because I've seen some people who are due after me mention how many weeks they are, & it's usually more than I figure I am.

By my calculations I'm 19w3d. I'm due sometime between Feb 26 & March 1, depending on what calculator I use.

I figure it out by seeing how many days I am past O (122 today), then divide it by 7. Multiply the whole number (17 atm) by 7, then subtract that from the number of days past O to get the day I'm on. Then I add 2 weeks to bring it up to the "af" due date.

How's everyone else figuring out where they are?

mom to all boys B: 08/01ribboncesarean.gif,  C: 07/05 uc.jpg, N: 03/09 uc.jpg, M: 01/12 uc.jpg and far too many lost onesintactlact.gifsaynovax.gif

Devaskyla is offline  
Sponsored Links
Advertisement
 
#2 of 22 Old 10-06-2008, 08:59 PM
 
Motherto4's Avatar
 
Join Date: Apr 2008
Location: Oklahoma
Posts: 511
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I did mine based on my LMP and when the Dr did my dating ultrasound it was accurate with what I figured. You can get google due date calculators and I think some do from ovulation

Married to a WONDERFUL man, SAHM of Israel 9(b) , Ireland 5(g) , Iceland 4(b),  Italy 2(g), Scoltand 9 m(g), and pregnant with baby #6

 

Motherto4 is offline  
#3 of 22 Old 10-06-2008, 09:21 PM
 
lanielayne's Avatar
 
Join Date: Jun 2005
Location: in a beautiful Montana valley
Posts: 2,047
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Holy moly, you have confused me. Let me think this out. I think I am somewhere around 15w5d by my calculations. I just add a week every Wednesday since that is the day I am "due" on. Let me see where that puts me with the way you do yours... Um, I think yours has me at 15w4d so really close.

~Lanie mom to Layne, Liam, Maren, Meridian, and Melora
lanielayne is offline  
#4 of 22 Old 10-06-2008, 09:30 PM
 
dividedsky's Avatar
 
Join Date: Jul 2006
Posts: 709
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
you confused me, too... my brain hurts

the day you ovulated is 2 weeks, when your period was due is 4 weeks. so if you o'd on a monday, your period would be due 2 mondays later, and then every monday going forward you go up a week
dividedsky is offline  
#5 of 22 Old 10-06-2008, 09:44 PM
 
hunterofkyle's Avatar
 
Join Date: Jul 2005
Location: Kingston, NY
Posts: 284
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
# of weeks gestation is the # of weeks since O - so I add two weeks because I always O late and would need to adjust my LMP. I am due March 17th and today I am 17 weeks (since theoretical LMP - 15 weeks gestation).

Mama to 4.5
hunterofkyle is offline  
#6 of 22 Old 10-06-2008, 11:13 PM
 
DanelleB's Avatar
 
Join Date: Jan 2008
Location: Jefferson County, MO
Posts: 724
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I also just googled "due date calculator", and that was confirmed by ultrasound.

~Danelle~ Mama to four wonderful, intact kiddos ~~ Cami (10), Jimmy (5), Ella & Alex (2/09), and Newbie due 8/11 
DanelleB is offline  
#7 of 22 Old 10-06-2008, 11:54 PM
 
liberal_chick's Avatar
 
Join Date: May 2005
Location: California
Posts: 1,789
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I just used an online due date calculator. Then I started spotting and went in for a u/s which put me a week and a half later than I thought (a follow up u/s followed this pattern). So mine is based on very early u/s dating.

Wife to an amazing man love.gif, mommy to 3 wild dudes: ds1 (5/23/05 @ 30 weeks), ds2 (3/5/09) hbac.gif, and ds3 (9/26/10) hbac.gif. Part time librarianread.gif, full time mommysupermod.gif, occasional chef and maid.

liberal_chick is offline  
#8 of 22 Old 10-07-2008, 12:05 AM
 
javilu's Avatar
 
Join Date: Oct 2007
Location: California
Posts: 1,763
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
I ovulated on a Monday, so I just count weeks since then (and taking into account that ovulation day was actually "2w" based on LMP, even though I know I ovulated on CD 12). Every Monday, I count it as having finished the last week/starting the next (in other words...er, numbers, Xw,0d).

SAH dissertating mama femalesling.GIF to my sweet little boy (2/2009)
and his rainbow1284.gif baby brother (7/2011)
javilu is offline  
#9 of 22 Old 10-07-2008, 10:04 AM
 
Malva's Avatar
 
Join Date: Nov 2005
Location: Canada
Posts: 1,698
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I count back from my due date. I had a dating u/s early on so it should be pretty accurate. I'm 16 weeks 4 days. (due on March 20)
Malva is offline  
#10 of 22 Old 10-07-2008, 10:50 AM
 
eewieew's Avatar
 
Join Date: Jul 2008
Location: bmore hon
Posts: 955
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I just go with what I was told at my ultrasound appt, which is 19w5d. Which adds up based on my LMP.

: single mom extraordinaire, keeper of eew since 02/09
eewieew is offline  
#11 of 22 Old 10-07-2008, 11:40 AM
 
lanielayne's Avatar
 
Join Date: Jun 2005
Location: in a beautiful Montana valley
Posts: 2,047
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Oh and I guess I should also mention that I already adjusted my due date according to when I ovulated then used one of those online calculators to figure it out. The calculators say the 24th, I say the 25th (as what I would be going by if I were having an assisted birth), and my ultrasound said the 21st. I expect to go right around those dates sometime. If I am late I will be surprised!

~Lanie mom to Layne, Liam, Maren, Meridian, and Melora
lanielayne is offline  
#12 of 22 Old 10-07-2008, 12:36 PM
 
My*Scorpio's Avatar
 
Join Date: Aug 2006
Location: Troy, Michigan
Posts: 1,280
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I think I'm 18wks and my due date is 3/8, so that jives with your method.

Expecting a boy? Be sure to check out MDC's Case Against Circumcision!
My*Scorpio is offline  
#13 of 22 Old 10-07-2008, 01:40 PM
 
Multimomma's Avatar
 
Join Date: Jan 2008
Location: Home
Posts: 1,550
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I also got a due date from the ultrasound, and just used a pregnancy calendar to set up a widget on my blog.

I'm not too tied up in the due date though, as I've never had an early baby. In fact, none of my babies (even Ava, whom I was on bedrest for premature labor) have been earlier than eight days when left alone.

So....all a moot point.

Nine kids run.gif and four angel.gif, living and learning all the time

Multimomma is offline  
#14 of 22 Old 10-07-2008, 02:36 PM
 
kohlby's Avatar
 
Join Date: Dec 2005
Posts: 878
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Since I know I ovulated on either cd 14 or 15, I count from LMP. (I had several first trimester ultrasounds due to being high risk. And my DH had chemo on cd 16 so I also know later isn't possible).
I'm due on March 5 and the way I calculate, I'm 18w 5d today.

(I have due in Feb/March in my siggy since I have to have a repeat c-section and I'm high risk - so this baby will be born in Feb. though I don't hit 40 weeks until March).
kohlby is offline  
#15 of 22 Old 10-07-2008, 03:43 PM
 
filiadeluna's Avatar
 
Join Date: Oct 2007
Posts: 3,231
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
My "due date" is March 7th. Mine is based on LMP, and the date my Midwife gave me. I actually ovulated early (for me) that month, at CD 15. I have been known to ovulate much, much later than that, and maybe that's why it took me so long to get pregnant? When people ask when I'm due (IRL) I mostly just say "March" so they won't bug me about when I'm going to have the baby in case I go over 40 weeks.

-
filiadeluna is offline  
#16 of 22 Old 10-07-2008, 04:31 PM
 
DomerJen's Avatar
 
Join Date: Feb 2007
Location: Pittsburgh
Posts: 1,209
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I count from my O, which was cd 14. I'm 18w4d today and I'm due March 6.

Incidentally, both the wheels that my different mw's use say something different (not sure what... they are off from mine by a day or 2) which is obnoxious, since I"m counting from O. I try not to let it bug me since it's not like DomerBaby is arriving then anyway.

Homebirthing mama of 2
DomerJen is offline  
#17 of 22 Old 10-07-2008, 05:02 PM
 
DanelleB's Avatar
 
Join Date: Jan 2008
Location: Jefferson County, MO
Posts: 724
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I actually calculated my "LMP" by counting two weeks back from my O date since I ovulate late. The babies measure exactly to that date. I'm "due" March 10th, and am 18 weeks today (Yay!)

~Danelle~ Mama to four wonderful, intact kiddos ~~ Cami (10), Jimmy (5), Ella & Alex (2/09), and Newbie due 8/11 
DanelleB is offline  
#18 of 22 Old 10-07-2008, 05:23 PM
 
peacelovingmama's Avatar
 
Join Date: Apr 2006
Location: San Francisco Bay Area
Posts: 2,781
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I know when I conceived so I just typed that date into a dd calculator and came up with March 17 (although my doctor gave me an edd of March 11 based on LMP and u/s). So I am 17 weeks but a week ahead of that according to my doctor (but I'm right and he's wrong since he wasn't there when we conceived -- thank goodness!).
peacelovingmama is offline  
#19 of 22 Old 10-07-2008, 06:14 PM
 
sonitaw's Avatar
 
Join Date: Aug 2008
Posts: 215
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
My DH was gone most of June (YES THE BABT IS HIS -- naughty naughty ladies :-P) And I have a crazy cycle so I guessed the date of conception, DH came home from a trip to China, woke me up at 1:30am on a Thursday night insisted that I smelled good and got all frisky, how could I forget that? When I went in and told them I thought that was the conception date, they didn't beleive me, but when they looked at the US and worked back from there it was exactly that date!! So you are your date of conception plus two weeks pregnant (so 15 weeks plus 2, I am 17 weeks)
sonitaw is offline  
#20 of 22 Old 10-07-2008, 07:53 PM - Thread Starter
 
Devaskyla's Avatar
 
Join Date: Oct 2003
Location: in my great new home
Posts: 4,596
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I guess the way I figured it was kind of confusing.

If I just count weeks from O & add 2, it gives me the same number, but then I have to remember when I o'd instead of just looking at the number of days, which is calculated for me in ovusoft.

It'll be interesting to see where the ultrasound puts me, even though it's totally inaccurate.

mom to all boys B: 08/01ribboncesarean.gif,  C: 07/05 uc.jpg, N: 03/09 uc.jpg, M: 01/12 uc.jpg and far too many lost onesintactlact.gifsaynovax.gif

Devaskyla is offline  
#21 of 22 Old 10-08-2008, 12:40 AM
 
She2dancer's Avatar
 
Join Date: Jun 2005
Location: Red Sox Nation
Posts: 1,048
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
I googled due date calculator and used my LMP since I usually ovulate around 14 days anyway (and I am pretty confident of the conception date)...based on this I am 20w3d with my due date being Feb 23rd, though I am very confident that this will be a March baby

Homeschooling catholic vegan Mama to my boys Simon (7), Keegan (5), Ezra (3) and ??? due November
She2dancer is offline  
#22 of 22 Old 10-08-2008, 03:03 PM
 
*~Danielle~*'s Avatar
 
Join Date: Mar 2005
Posts: 1,148
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Due date calculator online that factors in length of cycle and luteal phase.

But I have also heard you can take your lmp and subtract 3 months and then add 7 days.

I'm due around March 23 and doing the subtracting 3 months adding seven days thing I am due March 24th...so baby will come sometime in March.

Trying to build up my house, not tear it down namaste.gif.   Got 3 wonderful kids jumpers.gif  ribboncesarean.gif autismribbon.gif, blessed with a wonderful husband luxlove.gif and have the privilege of staying home full time to enjoy it all! 

*~Danielle~* is offline  
Reply

User Tag List

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page


Forum Jump: 

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off