The ultrasound sheet she gave me says it is for dating and viability.
At the point of the ultrasound I will be just a few days short of 17 weeks based on my LMP date. They will do a few measurements and general anatomy check.
The viability scan is usually done between 6 to 10 weeks of pregnancy when the first home pregnancy test shows a positive result.
All scans done during pregnancy are carried out abdominally though sometimes the viability scan may need a vaginal probe, as it would be difficult to judge the health and status of the foetus abdominally during such early gestation.
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Disclaimer: The Health does not guarantee any specific results as a result of the procedures mentioned here and the results may vary from person to person.
Then it took them another 10 min in the second room to call me, and by then I was asking a passing staff member to please pee.
I peed a bit, and on the table my bladder was still too full and they sent me out to pee some more.