Labor Standards Act Article 51

A female worker may apply to be transferred to less strenuous work during her pregnancy. The employer shall neither reject her application nor reduce her wage.
中文原文 勞動基準法第51條
女工在妊娠期間,如有較為輕易之工作,得申請改調,雇主不得拒絕,並不得減少其工資。

English translation for reference only; the Chinese text prevails. Not legal advice.