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First trimester ultrasonic scans may show 'soft' markers for chromosomal abnormalities, such as the absence of fetal nasal bone or an increased fetal nuchal translucency (back of the neck) to enable detection of Down syndrome fetuses.While your sonographer takes measurments they will explain what you are looking at.Scans in early pregnancy are usually performed in the first trimester around 12 weeks.You may have a earlier scan, if you are experiencing pain or bleeding for example or unsure of LMP dates.Transabdominal ultrasound cannot reliably diagnose pregnancies that are less than 6 weeks gestation.Transvaginal ultrasound, by contrast, can detect pregnancies earlier, at approximately 4 to 5 weeks gestation.Below are scan pictures taken during the early weeks of pregnancy.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.).
The second baby has a genital nub that's more horizontal to the baby's body, parallel with the spine, so she's probably a girl. This nub is in a horizontal position, parallel with the spine, so could be female. It's best to wait until your anomaly scan, which you'll have between 18 weeks and 21 weeks.
Prompt diagnosis made possible by transvaginal ultrasound can, therefore, result in earlier treatment.
It is recommended that all pregnant women have a scan in the first trimester, to establish the date when the baby is due, check the number of babies also the position of the placenta.
A common method is to measure the mean sac diameter (MSD), add 30 to the sac size in millimeters, to give gestational age in days.
By the time the embryo becomes visible on ultrasound the sac diameter is no longer accurate in estimating gestational age.