Call the pulmonology department again and ask to leave a message for the doctor you are scheduled to see. In the message be sure to say that you are concerned because the nodule is growing. The doctor's nurse will get in touch with you and she can schedule you for an earlier appointment. That's what I would do but if you don't want to do that, ask if the doctor has a wait list and sign up. If there is a cancelation they will contact you. Good luck!