The definition of a skill is a talent or ability that comes from training or practice. 1  An example of skill is the capability to produce fine works of art.  An example of skill is basket weaving.
A normal WBC count is, as I wrote, anywhere and everywhere from 4.5 to 10.0 but during pregnancy those normal values can be between 6 and 16 in the third trimester and may reach 20 to 30 in labor and in early postpartum.
In a healthy pregnancy your HCG levels should double every 48 hours. But when the pregnancy is not progressing the way it should as in the case of chromosomal abnormality your HCG may rise at slower rates or rise at first and then start to decline. Low HCG levels do not cause miscarriage.