The Waiting Period of the Pregnant Woman if Her Husband Dies
Question :
A questioner says that his "aunt" (his father's wife) is pregnant, so should she observe the waiting period of four months and ten days due to the death of his father, or should she observe the waiting until she delivers her child?
Answer:
The Committee examined the question and replied that she must observe the waiting period until she delivers her child. And Allah is the Granter of success. May peace and blessings be upon our Prophet, Muhammad and upon his family and Companions.
Source:
The Permanent Committee
Fatawa Islamiyah, Vol. 6 Page 96