18Pregnancy and maternity discrimination: work casesE+W+S
(1)This section has effect for the purposes of the application of Part 5 (work) to the protected characteristic of pregnancy and maternity.
(2)A person (A) discriminates against a woman if, in the protected period in relation to a pregnancy of hers, A treats her unfavourably —
(a)because of the pregnancy, or
(b)because of illness suffered by her as a result of it.
(3)A person (A) discriminates against a woman if A treats her unfavourably because she is on compulsory maternity leave.
(4)A person (A) discriminates against a woman if A treats her unfavourably because she is exercising or seeking to exercise, or has exercised or sought to exercise, the right to ordinary or additional maternity leave.
(5)For the purposes of subsection (2), if the treatment of a woman is in implementation of a decision taken in the protected period, the treatment is to be regarded as occurring in that period (even if the implementation is not until after the end of that period).
(6)The protected period, in relation to a woman's pregnancy, begins when the pregnancy begins, and ends—
(a)if she has the right to ordinary and additional maternity leave, at the end of the additional maternity leave period or (if earlier) when she returns to work after the pregnancy;
(b)if she does not have that right, at the end of the period of 2 weeks beginning with the end of the pregnancy.
(7)Section 13, so far as relating to sex discrimination, does not apply to treatment of a woman in so far as—
(a)it is in the protected period in relation to her and is for a reason mentioned in paragraph (a) or (b) of subsection (2), or
(b)it is for a reason mentioned in subsection (3) or (4).