16 Pa. Code § 41.101
The following words and terms, when used in this subchapter, have the following meanings, unless the context clearly indicates otherwise:
Disability due to pregnancy or childbirth-Disabilities caused or contributed to by pregnancy, miscarriage, abortion, childbirth and recovery therefrom are, for job related purposes, temporary disabilities and should be treated as such in written and unwritten employment practices and policies.
Pregnancy-The state of being in gestation. Pregnancy is a physiological process. Pregnant women, however, have a variable degree of disability on an individual basis during which time they are unable to perform their usual activities. This subchapter relates to pregnancies without regard to the marital status of the mother.
16 Pa. Code § 41.101