Here is how it will go:
1) KaSak talk about Sak being prego
2) Shanaya eavesdrops like usual
3) Shanaya plots to pushes Sakshi down the stair and (I think) before this actually goes down Karan locks Shanaya in the store room with Aarav as a witness (probably snooping around or something?)
4) (I think, at this point I'm just being sarcastic now) Shanaya does something stupid - like a failed suicide attempt - since you know ... she wants to get back at Karan ... and somehow gets injured. BUT SHARDA ISN'T HOME TO SAVE HER!
5) Karan gets screwed because Sharda is a total nut job who doesn't realize what she is supposed to do.
6) Karan gets arrested, Sharda is sad, Sakshi is pissed at Sharda (come on Sakshi, she isn't your MAA anymore, she is your SAAS now. Rebel Sakshi!!!)
7) When things settle down, Sharda realizes that she is needed at home the most and her pehchaan becomes the housewife she originally had.
I hope no. 5 and no. 6 come true (though they were just my imagination). I want to see Shanaya think of something idiotic like cutting herself on purpose and I want to see Sakshi call Sharda her Saas and not her Maa.