I do not think that there is any confusion because they have been giving subtle hints now and then like Tappu's shock when she heard that she was pregnant, Ichcha's prayer at the temple to Krishna about the truth of Tappu's pregnancy, the pundit's asking Veer to give the blessed apple to Ichcha, Chanda's 6 month statement to raise doubt on the time of conception, the unnatural photo- gazing, Ichcha's inability to conceive after a couple of times, raising doubt about if Veer really could impregnate Taps when he was half dead and unconscious, the anonymous calls, the rat- falling pooja fiasco, etc... The discrepancy in the time may fall within her monthly cycle and so 15 days here or there may not be noticed.. But if people really start investigating as to the exact age of the foetus, the truth may be revealed..
Now if they suddenly show that it is Veer's kid only, then I will say that the CVs are confused and they themselves do not know what they are showing....