Dating Scans
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Category: Pregnant
Forum Name: Pregnancy
Forum Description: Pregnant! Wanting to chat to other mums-to-be (or dads-to-be)? Share your thoughts, experiences, and ideas... This is that place!
URL: https://www.ohbaby.co.nz/forum/forum_posts.asp?TID=39829
Printed Date: 23 July 2025 at 2:34pm
Software Version: Web Wiz Forums 12.05 - http://www.webwizforums.com
Topic: Dating Scans
Posted By: Looey85
Subject: Dating Scans
Date Posted: 07 July 2011 at 4:22pm
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Hi all
I just had a dating scan, and I am apparently measuring bang on 6 weeks. I expected almost 8 weeks based on my last period. Granted that my periods used to be crazy irregular, for the last 18 months, they have regulated and are usually 28-32 days. For the scan to be accurate, I would have had to ovulate on day 26-27 of my cycle... that just doesn't make sense. I know scans aren't accurate to the day, but this seems way off. I'm interested in hearing other peoples experiences with dating scans and whether you feel they were quite a way off. |
Replies:
Posted By: ChikkyD
Date Posted: 07 July 2011 at 4:52pm
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According to my LMP my due date was 12/01/2011
I never went for a dating scan and went for my NT scan which i meant to be done at 14 weeks, but this scan showed that i was only 11 weeks along.. i was so sure that i was right and the scan was wrong! They changed my due date to 02/02/2011 and my baby arrived on the 06/02/2011... Guess the scan was right after all! -------------   
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Posted By: Lillybetts
Date Posted: 07 July 2011 at 9:14pm
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Before my dating scan my due date was 18/11/11. That would of made me around 9 weeks along. Then at the scan they said I was only 5 weeks and 6 days along. So changed it to 11/12/11.
I went into labour on the 11th dec, but had her the 12th :) So mine was quite accurate and I have always had very irregular periods. ------------- http://alterna-tickers.com"> 
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Posted By: choco69
Date Posted: 07 July 2011 at 9:23pm
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usually the dating scan has a margin of error of 3-5 days - so normally they are bang on
mine was perfect to dates (and I conceived via IUI so knew the exact date of conception) ------------- http://lilypie.com">  
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Posted By: Kupukupu
Date Posted: 08 July 2011 at 5:13pm
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we are all sold the lie of ovulation happening for every woman 2 weeks after last day of period... that is the problem!! LOL
#1 I didn't have any scans and he was 10 days overdue by LMP #2 I thought I was pregnant so had HCg bloods done several times (neg) then a positive one so we knew a very small window of Ovulation and conception which placed me ovulating the day or so before my period was due. (and she was born 1 day overdue so bang on) #3 I was wise to this late ovulating thing so had a dating scan as I didn't have a clue where that would place me (unplanned UTD!!).... dating scan wiped 2 weeks off a generously allowed LMP.... and we'll see if this one arrives on time in a couple of months LOL Anyway- the long and short of it is that some women do ovulate late in their cycle and that is perfectly normal :) |
Posted By: Looey85
Date Posted: 08 July 2011 at 5:51pm
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I think I probably ovulated late... but not that late.
Obviously it's kinda hard for me because I don't know who the father is... so every day counts. For the scan to be more accurate than my cycle... I would have had to conceive on day 28 of my cycle... right when my period was due. So I think it's at least a week earlier than that. Anyway... I guess it really doesn't matter at this point, because I've spoken to one of the potential dads and they didn't take it too well. So I guess I really am doing this alone. I think the second will take it worse... |
Posted By: myfullhouse
Date Posted: 08 July 2011 at 8:41pm
Sorry to hear it didn't go well, although he may just be in shock and come round to the idea given a little time. Regardless, good luck with your pg ------------- Lindsey 
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Looey85 wrote:Posted By: Cinderella
Date Posted: 09 July 2011 at 10:31am
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Hey Looey- my oldest DS is now 15. His dad didn't want to know him. He has met him once and he still wants a relationship but I think he has accepted that it won't happen. He has a father in his life who he loves dearly and when he was old enough to understand I simply said his biological father couldn't cope with being a dad and was simply scared.
As a woman we get to choose if we have a baby. The father never has a say. Maybe give them the option of being involved or not. That way what ever happens it will be their choice. |
Posted By: choco69
Date Posted: 10 July 2011 at 9:20am
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Looey - if it helps your may have ovulated late due to you living in chch - there is alot of evidence from overseas that earthquakes can severely mess with a woman's normal ovulation cycle - so it may have delayed things - dating scans basically measure the crown/rump length which is pretty standard for all babies, they will be able to further confirm dates at the 13wk scan ------------- http://lilypie.com">
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Posted By: KarenMae
Date Posted: 11 July 2011 at 9:08am
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Looey - I think that early dating scans can put you a bit 'younger' than you actually are...
According to my ov date - due on the 11th Jan... went for dating scan on what should have been 7 weeks exactly and was put back to 6 weeks 3 days... due 15th Jan. Had further scan at specialist on what was now 10 weeks 1 day (according to dating scan) and was changed again... to 11 weeks, due 9th Jan. This was more like what I expected... I was a bit worried after the dating scan, but mind put at ease at the later scan... Wouldn't be surprised if that happens to you also... ------------- http://lilypie.com"> 
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Posted By: buzylizy
Date Posted: 12 July 2011 at 12:36pm
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I was pretty sure of my ovulation date and the scans matched up...until later...by 12 weeks he measured 2 weeks ahead consistently and ended up being a big baby. I think the earlier the scan the more accurate the date. Don't wait until the 12 week scan if you want to be sure.
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Posted By: Birdie
Date Posted: 13 July 2011 at 11:40am
Yeah the scan is more accurate the earlier it is as the baby can curl up and stretch out at 12 weeks making the measurement less accurate  ------------- http://lilypie.com" rel="nofollow">  
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Posted By: kiwisj
Date Posted: 13 July 2011 at 11:44pm
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My DS2 was planned and I was pretty sure of when I ovulated. I booked in to see my Ob/gyn at 5 weeks and he did a scan when I thought I was 7w .. he thought I was about 5w+ .. which would have meant getting a BFP before AF was due. Anyways, the OB went with the later date (I think it was around Oct 25, I was expecting it to be Oct 16) till my next scan, 4 weeks later, when bubs was measuring bang on to what I thought he should be. He arrived October 12. I've always heard the earlier the dating scan, the more accurate but they're based on averages so there can/will be outliers too!
Good luck with your pregnancy  ------------- SJ Callum - Dec 2008 Daniel - Oct 2010 |
Posted By: NewMummyJade
Date Posted: 17 July 2011 at 1:32pm
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With DD I went for a dating scan and based on the day we BD'd (it was only once all month so I knew that was the culprit) I would have been 9 weeks. But scan said 7 weeks 3 days, 11 days difference... I was so worried etc until my MW explained to me...
After you BD, sperm survives for 5 days, so if you ovulate before or within those 5 days you can get UTD, then once the egg and sperm connect it can take a day or so for it to get down to the uterus and implant. Hence why LMP and scan dates can be out by 6-7 days. ANywho, at my 12 week scan they brought me forward 3 days, so it moved to 8 days... Further along in my pregnancy DD measured 1-2 days bigger than the due date and I have now come to the conclusion that like once they are born, all babies grow at different rates, I think she just started off little and made u for it later on! :) From now on as long as the baby IS there, has a heartbeat and has grown since the last scan, nothing else worries me! ------------- http://lilypie.com"> 
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Posted By: MrsEmma
Date Posted: 18 July 2011 at 11:27am
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For DS I had m/c'd the month before so my dates were a bit of a guessing game as I hadn't had AF in between but had worked out the dates pretty well and was certain I was due 7th Jan 2010, at my early scan I was put back a week until 14th January and he arrived 20th Jan so the scan was more accurate.
With DD, I was positive of my dates - 100%. Again, the scan changed me from due 9th May to 19th May (10 days out) but I was sceptical of the change as I was so certain and had marked AF in my diary every month. DD arrived on 12th May so 39 weeks exactly and my MW said she looked a week early and I must have had a tummy bug or a flu and ov'd a bit later hence the change in dates. So, all in all - the scan dates were more acurate both times 
Wishing you all the best! ------------- http://lilypie.com"> 
http://lilypie.com"> 
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