"But restrictions on a woman’s liberty and property only begin with pregnancy. A woman worker with children is considered “unavailable for work” (which means that she cannot qualify for unemployment compensation), if she restricts her hours of availability to late afternoon and night shifts so that she may care for her children during the day.... Under these circumstances, a case can well be made that the anti-abortion law, in compelling a pregnant woman to continue this condition against her wishes, is not merely a denial of liberty, but also an imposition of cruel and unusual punishment on the woman. “Confinement” well describes the situation of the pregnant woman, or mother, who is denied work, or restricted in her work because of an employer’s decision on her ability to work."