That only means one thing gunjan got pregnant but bauji and bui broke all the relation with her and mayank was stuck taking care of her. I think mayank doesnt want sajan to unite because of the baby maybe he thinks that its not the right time or he thinks that samrat is not ready to take responsibility of a father.
Gunjan was pregnant for sure because if she is not then wats the point of doing it and why was it necessary for the CVS to show that.