It is in today's precap, and she also tells him that she is about to become the Mother of Anurag's child. In the actual episode he tells her that he is not behind Anurag going to jail and nor did he plan anything with Ronit, he says that with a lot of honesty, and I believe him! He also says "mujhpe koi bhi ilzaam lagane se pehle ek baar soch lijiye, you need to be very careful." It seems like Prerna herself believed him!