A question about tests for colon cancer?

hey all,
Just wondering, I recently did a blood test to check if i had any blood in my poop.
It came back negative.
does this mean that the chances of me having bowel cancer are negative as well?
My doctor said she is not worried about my health as my bowels have gone back to normal – she said that with colon cancer they don’t do that they get worse.
however i’m still paranoid… does anyone know if this is a sure way test to know?

She didn’t recommend a colonscopy.

Thank you