I think Jai and Bani may have just ensured that little Krishna is on the way. It was all very subtle.
Remember in the episode on Nov 24th, Bani gets up very late and Jai is ready to go to work? Now that is quite uncharacteristic of Bani unless she stayed awake late, thanks to Jai. That is why Jai tells her 'I did not want to distrub you, I wanted you to complete your sleep'. Bani was all very coy and asks Jai to stay back home and Jai teases her about it. All this indicates that the previous night must have been quite interesting for both of them.
I don't think they will show a repeat of 19/6, going by Prachi's embarassment doing that scene. It is hints like these that one has to pick from. I dont think the reports indicate that Bani is pregnant. Remember in the earlier episode when she and Pia were at the hospital on the same day, Bani's doctor asked another lady doctor to look into her case. She may have recommened some more tests and the results are of those tests.