I guess right now, the chances are Nil, they'll not show her pregnant due to many external and internal factors, which are already discussed.
But yes there's possibility of them showing her pregnant at later stage of the show, where they'll almost exhaust with all the possible tracks, FL's pregnancy tracks always gives good trps, so they'll treasure it for the right time, if they ever want to show it, maybe after the leap, where their Surrogate child will grow up, they might show her miraculously pregnant, btw it can be a good track, the child can get insecurity that his/her parents (Sairat) will prefer the second child more coz it's their natural child, Pakhi, if she would be around might brainwash the child and then Sairat handling both their kids with utmost care, they did show something similar on the line, in Choti Sardarni, Ph's another show.
But yes these are all good possibilities but there's a big "If", right now toh Surrogacy is our fate, and there doesn't seem any light of hope😪