Firstly you are to be congratulated on losing weight and gaining fitness especially when it comes to waist size which is best being half your height. You may need to lose further fat from your middle to prevent or reverse any diabetes.
Secondly, the only reliable way to know if you have hit the pre diabetes range is to go and get your 12 week average blood glucose done by your GP (the HBA1c) as this is the equivalent of the mean average of 300,000 blood tests. It measures the amount of glucose stuck to the haemoglobin in your blood so is a direct proxy for the amount of glucose on average going through your blood 24/7.
A fasting blood glucose is useful but not as reliable as the above because it is a snapshot and you may well have dawn phenomemon (a natural surge in bg at dawn) or indeed by p re diabetic but you can't really tell from just this.
Good luck and let us know how you get on.