Is there any saheeh report that says the du‘aa’ of a pregnant woman will be answered?
Question

                Is it true that the Duaa of a Pregnant woman is accepted. 
I would really appreciate if this can be clarified. Also, I would like to know if there are any specific good deeds that I can do while I am pregnant.
Praise be to Allah.
    After researching the matter, we have not found anything to 
    indicate that the du‘aa’ of a pregnant woman will be answered, either in the 
    marfoo‘ hadeeths (those that are attributed to the Prophet (blessings and 
    peace of Allah be upon him)) or in mawqoof reports (those that are 
    attributed to the Sahaabah). 

    But if the Muslim combines positive thinking about Allah, may 
    He be exalted, and certainty of His generosity with proper humility before 
    Him, then we hope that Allah will answer his du ‘aa’s and fulfil his hopes. 

    It remains for us to note that the du‘aa’ of the mother for 
    her child is one of the du‘aa’s that will be answered, because the Prophet 
    (blessings and peace of Allah be upon him) said: “There are three du‘aa’s 
    that will undoubtedly be answered: the du‘aa’ of one who has been wronged, 
    the du‘aa’ of the traveller and the du‘aa’ of a father  for his child.”

    Narrated by at-Tirmidhi (1905). See also Saheeh al-Adab 
    al-Mufrad, 372 

    Al-Mannaawi (may Allah have mercy on him) said:  

    “The du‘aa’ of the father for his child” is because he is 
    truly compassionate towards him and often prefers him to himself. As his 
    compassion is genuine, then his du‘aa’ will be answered. The mother is not 
    mentioned even though the emphasis on her rights may indicate that her du‘aa’ 
    is more likely to be answered than that of the father, because this is 
    something that is well known. End quote. 

    Fayd al-Qadeer, 3/301 

    If a pregnant woman prays for her baby to be righteous, smart 
    and of good character, then we hope that Allah will answer her prayer. 

    Please see also the answer to question no.
    13506 for a discussion on the 
    conditions of du‘aa’ being answered. 

    And Allah knows best.