I had one at 7w 5d coz i had a small bleed, and i was so so sick and dehydrated I had to stay in hospital, so they did one just to check if bub was okay, thats when they dated it.
Then at 12weeks
And again at 19w 3d (I was leaving for a holiday in England so they did it early)
And then I had a 3D/4D one at 31weeks....but that was just for enjoyment
We had ours at our first appointment with our OB which was at 10 weeks. Unless you have a history of problems, my OB won't see you until 10 weeks. I think it was a great time as there was a definite heartbeat not to mention DD acutally resembled a baby, albeit a tadpole baby. LOL! Our next scan was at 12 weeks then 16 then 20 then every appointment with the OB from there.
The first NB scan is at 13 weeks when they check for abnormalities in the skin around the neck/spine (can't remember what it is called) Before that it's just to check for dates so if you are 100% certain about your dates then aim to get an appointment around the 11 week mark so you can have the scan in time. IMO anyway.
DH and I are heading for our first scan next week, which by estimate will be 8w3d! Have to get a dating scan due to irregular cycles and PCOS so this little person is definitely a miracle!!
if it's just for dating purposes I don't think there is really any hurry, speak to your OB or GP and they will tell you when they want a dating scan. Most woman have an early scan when they have had problems in the past but the routine 1st scan is at 12 weeks. For this pregnancy I had a scan at 7 weeks, 9 weeks, 12 weeks and 19 weeks.
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