Darla,
A couple of thoughts and questions. Your situation has specifics that may be different from those in the studies that produce recommendations. The link at the end is to a LONG article that discusses specifics.
BCG has been shown to be more effective when a 6 week induction course is followed with a maintenance program that begins 3 months after the induction course. However, we are all in our unique situations.
So, question, how soon after the first round of BCG did tumors reappear, and might maintenance doses of BCG prevented the recurrence ?
Adding interferon to a second induction course is commonly used, and again maintenance has been shown to improve the outcome.
Second question, Does your doc plan to continue with maintenance doses of BCG ?
Expert consensus document - use of BCG for bladder cancer
www.nature.com/nrurol/journal/v12/n4/full/nrurol.2015.58.html
The article cover issues including : Optimal schedule and duration of BCG therapy, Definition of BCG failure, Options after BCG failure. There is a lot to read, but you may find relevant passages to your situation - and you can then discuss the authors opinions with your doctor.
Best,
Jack