The thing is whether only Archna will know about Naren's baby or the whole clan ie If Naren and Pari too get to know it then their marriage will be unhappy for Pari wont accept to be the 'second' official wife.
Apart from it There are number of characters who know about Ankita's baby ie
The first Karamarkar Doctor Mansi Shashank, Shekhar and Archna the first thing to unravel will be Naren Pari knowing the truth of Ankita's so called sacrifice. But if the leep starts from a juncture wherein Naren/Pari already know the truth the senario can be very different. How can it unravel
Naren coming across his written vows (Much like the movie The vow)
Naren coming across Ankita's doctor and the dawn of truth
Sunanda's reentry and her tussle with Pari and her recurrent comparisons wth Ankita
Naren Pari fighting like Ovi and Arjun as they both will be knowing baby's truth
Naren coming across Ankita's baby by chance without knowing her identity (The most sick repeated track) as Ankita and Mansi's baby will have only one school left for study.
The bone marrow track and Ankita coming back to Naren for help (Not again Ekta)
Ankita as a strong businesswoman (least likely to happen) playing single parent to her child (Can be)
Mansi's child staying in karmarkar house (can be a weird track given its Ekta show
Mansi loosing her child and in a miserable plight (No Ekta leep is complete without killing a baby)
Ankita married to Shekhar (🤢🤢)
New hero with Ankita 👏
Tussle between Archna and Pari as Archna will be unhappy after Ankita's exit and Pari wont like it
Tussle between Soham and Deshmukhs (Nothing new)
Something new (We hope against hope😆)