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Dating scan

(7 Posts)
Benzer Thu 29-Sep-11 22:35:40

Anyone find out at 20 week scan that they were further on than they thought?

ConcreteElephant Fri 30-Sep-11 20:27:55

I think most people get a dating scan at around 12 weeks to determine how far along they are? Then the 20 week scan is a very detailed medical assessment for anomalies. I know not all PCTs operate the same process but I think it would be unusual to get as far as what you thought was 20 weeks and find out you were very much further on?

Has this happened to you?

catsareevil Fri 30-Sep-11 20:32:56

The 20 week scan isnt really a dating scan because by that stage other factors can influence the size of the baby.

MrsHuxtable Fri 30-Sep-11 20:58:08

Yes, dating scans are only done between 10 and 16 weeks. By 20 weeks babies already grow at different rates so they wouldn't change your dates surely.

IssyStark Fri 30-Sep-11 21:35:00

If you haven't had a scan earlier in your pregnancy and were unsure of your dates, it can happen. I had a friend who had to have IVF for her twins due to fertility issues with both her and her partner, so they were a bit lax with contraception post-twins. She was rather surprised to find out she was pregnant at about 4 months in. She had a scan and they estimated her at about 19 weeks.

However as everyone else says, there are so many factors that by 20w they can only give guesstimates, within a couple of weeks either way.

Benzer Sat 01-Oct-11 20:46:28

Thanks all! Thought so, but feeling HUGE at 12 weeks and not quite sure of my dates. The Midwife did say I'd get a 'better' idea of exact due date at my 20w scan and that they do change due dates now, even if it's just a few days' difference (they didn't before apparantly!).

ConcreteElephant Sun 02-Oct-11 08:33:59

Hi Benzer, that's very interesting. I just had my 20 week scan this week and baby was measured as average across the board of the expected ranges - I genuinely wonder how they might distinguish at this stage between a baby at the smaller/larger ends of the range and one who was 'younger'/'older' than previously thought.

I am also feeling huge, and have done since about 10 weeks (this is DC2) so imagine my joy to hear that baby is just average sized so the rest is probably just <ahem> padding!

Congratulations on your pregnancy smile

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