At this point, an ultrasound should show evidence of a developing embryo, despite being so small. As with an ectopic pregnancy, there are different treatment options available if you have a miscarriage. By 8 weeks gestation, your baby can usually be seen with transabdominal ultrasound. Sometimes a pregnancy may not be developing in the correct place an ectopic pregnancy. First trimester ultrasound is performed in the first months of a pregnancy. At this early stage of pregnancy, the gestational sac already contains the yolk sac, embryonic disk, and amnion, but these structures are too small to be visualized by sonography.
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First Trimester Scans
Week by Week: By the fifth week of pregnancy, doctors and sonographers can begin to detect a heartbeat using an ultrasound machine. First Trimester Ultrasound Sonogram Baby developing inside you over the weeks and months. This is presuming that the pregnancy is actually at this stage of development. Yolk sacs and fetal poles the early fetus are seen in 2 completely separate sacs One gestational sac seen with 2 yolk sacs visible inside it Identical monozygotic twins.