I don't think she is prego...remember in yest epi...when the doc came out after checking Khushi...doctor was not shown happy or even smiling at all...she was tense and ROSIM were asking about the results...we viewers were left wondering and the scene quickly changed to BW house where everyone is waiting for them to return... I think when Khushi went for check-up with doctor and ROSIM were sitting in the office, something happened behind those green curtains...either Khushi threatened the doc or Veeru already managed to do influence the doc.
But we will see Simar being tortured by Khushi...but in the end everyone will know how Khushi lied about pregancy and then all her evil deeds will be exposed.