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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.
In early pregnancies, the actual cardiac rate is less important than its presence or absence.
The fetal pole grows at a rate of about 1 mm a day, starting at the 6th week of gestational age.
At 4 weeks and 3 days, a tiny gestational sac becomes visible within the decidua.
While a gestational sac is sometimes seen as early as during the 4th week of gestation, it may not be seen until the end of the 5th week, when the serum h CG levels have risen to 2500 - 3500 m IU/m L.
Below are scan pictures taken during the early weeks of pregnancy.
One gestational sac seen with 2 yolk sacs visible inside it Identical (monozygotic) twins.
This results from an early embryo dividing into 2 genetically identical embryos.
The yolk sac is first visible at 5 weeks and it is always present by 5 weeks and 4 days.
There are lacunary structures [cavities or spaces] at the site of implantation.
It initially appears as a round, anechoic structure.