Dating by ultrasound
It initially appears as a round, anechoic structure.
In experienced hands, it may be detected as early as 30 days gestation by TVU.
Measurements taken at these early scans will help to; confirm a pregnancy, date the pregnancy and to see any problems that may occur in the pregnancy ( low lying placenta, twins etc.).
Scans in early pregnancy are usually performed in the first trimester around 12 weeks.
The first trimester is months one, two, and three of your pregnancy.
Since the connecting stalk is short, the embryonic pole is found near the wall.
Transabdominal ultrasound will provide a panoramic view of the abdomen and pelvis and is noninvasive, whereas transvaginal ultrasound provides a more limited pelvic view and requires insertion of a probe into the vagina.
Transabdominal ultrasound cannot reliably diagnose pregnancies that are less than 6 weeks gestation.
A nuchal translucency ultrasound (commonly called a “nuchal scan” or “NT scan”) is an ultrasound performed between 11.5 and 13 weeks 6 days gestation.
It is usually part of an assessment called combined first trimester screening.
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You may have a earlier scan, if you are experiencing pain or bleeding for example or unsure of LMP dates.