Bmus fetal size and dating
In that case, you might need further tests, or a second scan to check the first scan's findings.
The dating scan will also show if you're expecting twins, triplets, or more.
Most hospitals or ultrasound clinics ask you to arrive with a full bladder.
The ultrasound technician will put some warm gel on your tummy and move a small hand-held device (transducer) over your skin to get views of your baby.
It's also a chance for you to see your baby for the first time. If you have one, you may find it happens between 11 weeks and 14 weeks of your pregnancy, along with your prenatal screening tests.
During your dating scan your baby is carefully measured.
As long as the timings are right, you can have the NT ultrasound and blood test at the same appointment as your dating scan.
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Evaluation of gestation emedicine.[Accessed July 2017] Morin L, Cargill Y, Glanc P et al. Ultrasound Evaluation of First Trimester Complications of Pregnancy.
But that won't tell you when you actually conceived.
Conception usually occurs around 14 days after your LMP, which is when you ovulate.