A woman who is struck while pregnant

Ma'mar says that al-Zuhri used to say: "If a woman is killed while she is pregnant, then blood money and a male or female slave are due, even if she has not delivered the child."

Sa'id says that Qatadah was asked about a woman who was killed while pregnant: is anything due for her child? The narrator said: He used to say: "Nothing is due for it until she delivers the child."