Or P will blackmail Sai later that Sai has to leave the house else she will harm the baby. So when Sai leaves she will get both Virat and the baby.
Sai may leave as she wants the baby to be safe.
But then Virat may be upset and may be distant from pakhi but do all duties of father and they will show Pakhi as mother.
Maybe Sai should conceive again.