Same here - 3 month wait after the positive Cologuard - this during COVID when routine exams such as colonoscopies were being delayed and before vaccinations were available. Back then, nobody wanted to be in a doctor's office.

I don't know if this can be done or how it can be done, but there are blood tests such as CEA that are used by oncologists to determine the activity of cancer and if chemo is working. While I don't think those can definitively rule out cancer, it can give you an idea of what's happening and urgency. I have no idea if your general practitioner can specify to do one, if insurance would pay for it and what an out of pocket cost would be.

I'm thinking to run your concerns by your physician and ask what he can and will do to handle your concerns.

Just for reference - from positive Cologuard results to colonoscopy was almost 13 weeks (Christmas and New Years breaks included) and my surgery was 5 weeks later, chemo was started about 7 weeks after surgery, if I recall correctly.