(a) A provision in this chapter referring to discrimination because of sex or on the basis of sex includes discrimination because of or on the basis of pregnancy, childbirth, or a related medical condition.
(b) A woman affected by pregnancy, childbirth, or a related medical condition shall be treated for all purposes related to employment, including receipt of a benefit under a fringe benefit program, in the same manner as another individual not affected but similar in the individual's ability or inability to work.