I think Anu and pre gets separated first in Mr. Bajaj track after that misunderstanding starts
Anu comes to know about pre marriage to Bajaj very late. By the time Anu reaches to stop the marriage it is too late.
So one misunderstanding is pre pregnancy. But not sure how it will be used because as per now pre is already pregnant from 4 months or so and Bajaj is coming now.. it is illogical misunderstanding.. so let's wait