According to Pregnancy Week by Week, during the eighth week of pregnancy, a woman's uterus has expanded to about the size of a large orange or a small grapefruit. The uterus of a woman who is carrying twins is larger.
According to WebMD, during the eighth week of pregnancy, a baby's eyelid folds and ears form along with the beginnings of little fingers and toes. The mother's blood volume begins to increase and her heart pumps 50 percent more blood per minute. By the eighth week of pregnancy, most women experience some moodiness as well as morning sickness from certain smells.