Foods that can be eaten include: meat, hard cheese, tofu, eggs, butter and vegetables with no starch. Some foods that are NOT allowed include: cereal, pasta, milk, breads and other sugars. If you are scheduled in the late afternoon and can eat breakfast before the scan, it must be a low carbohydrate diet as well.
The placenta (also known as afterbirth) is an organ that connects the developing fetus to the uterine wall to allow nutrient uptake, thermo-regulation, waste elimination, and gas exchange via the mother's blood supply; fight against internal infection; and produce hormones to support pregnancy.
The amniotic sac develops inside the uterus and it holds the growing fetus and the amniotic fluid. The amniotic fluid is there to protect the fetus and aid in its development, and over the course of the pregnancy, the fluid contents change from water from the mother to urine from the fetus.