Could I have pre-diabetes and not know it?

Yes. Unlike type 2 diabetes, pre-diabetics might not have any physical signs or symptoms. That's why it's important to get your blood tested if you are an "at risk" population: family history of diabetes, obese/overweight, age > 45 or high risk race: african-american, native american, latinos, asian american/pacific islanders.
Yes. Yes, it is possible. It is wise for all adults to have a fasting blood glucose level checked once yearly to screen for diabetes.