The article I pasted below explains it pretty clear. My sister is Rh negative and had to get the Rhogam shots when she was pg with all 3 of her boys. All are just fine :)
During pregnancy, Rh-negative is the only one of these blood groups that can cause a problem. It turns out that an Rh-negative mother can make antibodies (part of her immune system's response to invaders) against Rh-positive blood cells, even against those of her own baby. This is called Rh sensitization.
The second sign,yolk sac,which provides nourishment and produces the stem cells that develop into red blood cells, white blood cells, and platelets.
By 5-6 menstrual weeks, one can see an embryo and its lengths are visualized. Cardiac activity, with heart rate >118, should be visualized when the embryonic length is 4 mm or greater, which indicates a healthy live fetus. But during later weeks, other parts can be visualized depending upon Gestational age.
0
Choroid plexus cysts (CPCs) are cysts that occur within choroid plexus of the brain. The brain contains pockets or spaces called ventricles with a spongy layer of cells and blood vessels called the choroid plexus. This is in the middle of the fetal brain. The choroid plexus has the important function of producing a fluid called cerebrospinal fluid.
Recommended
