Hello Josie... Welcome to the forum. I'm sorry you've had such a difficult and scary time. Any irregularity like that automatically puts us into panic mode. My only suggestion is to call your uro's office, explain the trouble you've had, and ask if you can just come in for a cytology test. That only requires a urine sample and you don't even have to see the doctor. They would be doing that in September anyway, so a little early should be reasonable.
I had my primary care doctor do one for me in May since my uro/surgeon put me on a one-year cysto schedule last time which means I don't go back until October. I got a bit nervous waiting 12 months, so had the cytology done to ease my mind. I did have to pay for it myself which was around $100, but it was worth it.
About your question of cancer coming back... I see you had non-invasive, low grade. That is the best-case scenario if one does get bladder cancer. It does, however, have a tendency to return for some people. If that is the case, it can be taken care of with another TURBT and will generally be the same type. Try to take this in stride because it is the nature of BC, but yours is very treatable, even if it comes back.
Please let us know how your next check-up goes also.