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How much do most people's dates change (if at all) at the 12 week scan?

(45 Posts)
porpentine Thu 12-May-11 10:32:20

I ask because I wanted the nuchal scan but my appointment's not until I'll be 13+4 - which seems cutting it a bit fine if I'm a couple of days out (and at a previous scan I was 2-3 days further on than they first thought).

So are most people pretty accurately what they thought they'd be at their 12 week scan, or does it change a lot? Just trying to get a sense of how likely it is that they'll be able to do the nuchal...

ct148 Thu 12-May-11 10:33:55

My dates only changed by a day. So originally my due date was 24 Aug, then after the 12 week scan they changed it to the 25th.

caz05 Thu 12-May-11 10:37:56

Mine changed from 1 June to the 9th June at the 12 weeks scan

BrassicaBabe Thu 12-May-11 10:43:08

Mine changed by 2 days.

Eglu Thu 12-May-11 10:47:26

Mine changed by 11 days with DS1, but I have a long cycle, so don't fit the mould so to speak.

Flowerydems Thu 12-May-11 10:48:26

I had my scan at 13+3 apparantaly they try to get it as close to 13 weeks as possible now which was really frustrating (especially since I'd started counting down the days til week 12).They managed the nuchal fine with me though and she seemed quite happy. I was only 1 day less when they checked the size of the baby though.


ToriaPumpkin Thu 12-May-11 10:50:07

Mine changed by one day.

TallulahBetty Thu 12-May-11 11:06:06

One day here too.

Bumpsadaisie Thu 12-May-11 11:41:15

By a couple of days (later). Mind you I know I ovulate on about day 20 so I was expecting to be put back a little from what the "LMP" calculators said.

Isntitironic Thu 12-May-11 11:46:20

Mine went back by 4 days - 29th Sept to 3rd Oct.

pirateparty Thu 12-May-11 11:46:21

One day different with this one, and three days with ds.

OrangeGloss Thu 12-May-11 11:48:55

Mine changed by 11 days, I had a 35 day cycle, and has been consistent with this measurement since

PrincessScrumpy Thu 12-May-11 11:53:27

Mine changed by a week to what I thought my dates were as my cycle is short and very regular.

LoveBeingAbleToNamechange Thu 12-May-11 12:08:56

Mine changed by about three weeks, but it was due to very specfic circumstances. It meant I wasn't able to have that test. I had already moved my scan date after thinking the one they'd given me was a bit late! Just call and see if they have had a cancelation.

prolificwillybreeder Thu 12-May-11 12:12:14

Mine changed by two days.

buttonmoon78 Thu 12-May-11 12:20:47

Mine changed by about 10 days. For them that is. I 'knew' when I was due, had a scan at what they said was 5 1/2wks, then one at what they said was 7 1/2wks then one at what they said was 12 weeks and they said I was 13 1/2wks. Quel suprise!

Happened last time too.

lolajane2009 Thu 12-May-11 13:03:16

5 days later here but i have a 35 day cycle

largeginandtonic Thu 12-May-11 13:06:44

Am the same as Lola. Mine always change by a week or so as i have a long cycle.

I am glad about this as there is no way i want them jumping up and down at the end about a late baby when i know perfectly well it is not late!

Badgerwife Thu 12-May-11 13:12:29

Mine changed from 28 July to 22 July. I must have ovulated straight after my period, which I didn't know was possible.

KatieWatie Thu 12-May-11 13:45:02

Mine changed by just 2 days which was amazing considering how messed up my cycle was at the time, some bleeding going on etc. so we'd just taken a wild punt at the EDD.

vallinnapod Thu 12-May-11 13:45:39

Mine was bought forward from 9 Sept to 4 Sept....which I though was interesting considering it was IVF therefore all dates were fairly indisputable!

He has been consistently 1 day ahead in all his measurememnts of even this from 14 weeks!

porpentine Thu 12-May-11 20:21:38

Hmm, definitely will try and get a cancellation then. This is all very helpful - thank you!

ImBrian Thu 12-May-11 22:49:01

With my first pregnancy I was put back 2 weeks, 2nd was bang on, 3rd was put back 3 days and this one put back one day. I have irregular cycles

LDNmummy Fri 13-May-11 00:37:19

Mine was spot on to the day. I take it as a good sign of a cooperative LO in the future grin

oldboy Fri 13-May-11 06:26:23

I had a scan at 7 weeks and was given a date a week later than i had worked out then at 12 week scan a diffrent one again which was 3 days diffrent. And with ds was 12 weeks at scan and was told was 13weeks.

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