I really appreciate your help. Cheers! But then why did Sonu have to pertend she miscarried, why did Shruti not give her daughter to Sonu when she took Sonu's son? And why does Gunn have Shruti's daughter instead of Sonu?!
Because Sonu didn't want a child. Gunn miscarried her baby, and she and Krishna wanted a child. Sameer wanted a boy, and Shruti was scared he would reject her and their daughter. Sonu saw this and wanted to help them out. She never wanted a child (at that age).