One never needs to think about the answer to this question. It is obvious that the mother should always be saved. This is what I think. Coz the baby has yet to come but the mother already shares so many relationships and it is harder to lose her. We weren't shown but Kuku uncle did sign some papers. God knows, what choice he made...
I hope it is Saru.
If not then I can predict the story, Ashok would always blame papaji for Saru's death and would hate the baby. 😡