What organs are present inside in a 12-week fetus?

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Normally intestine is outside body of the fetus from 6 to 10 weeks of gestation is known as an intestinal hernia. Around 11 weeks it should be inside the body of the fetus. If you have been irregular periods there could be a discrepancy of dates between the scan and your menstrual periods then you need rescan to check things again. Gastroschisis and omphalocele two defects if a similar place of a fetal body with some difference. Better to have nuchal translucency check now as it should be done around 13 weeks via scan in fetus having a risk of congenital defects. You might need double marker test to check for any syndrome. So better to have serum beta hCG and serum PAPPA (pappalysin-1) checked. Have nuchal translucency and double marker test now and discuss here or local gynecologist and then repeat scan as per schedule after two weeks.