Question: The questioner states that his father’s wife is pregnant. Is her mourning period due to his father’s death four months and ten days or is it until she gives birth?
Response: The conclusion of the study of the Committee is that her mourning period is until she delivers.
And with Allaah lies all success and may Allaah send prayers and salutations upon our Prophet (sal-Allaahu `alayhe wa sallam) and his family and his companions.
The Permanent Committee for Islaamic Research and Fataawa
Fataawa al-Mar.ah.fatwaonline.com