Your history is very crystal clear and clearly suggests that you were definitely diabetic on your first testing of sugar which was 217 ( fasting ).
Subsequently with dieting and exercises you brought your PP level to 149 in one month but HBA1c
HBA1c was high because it shows the average level of blood sugar of past three months.
Now with dieting and regular exercises and lowering of your BMI has resulted in normalisation of blood sugar levels.There is no need for any anti diabetic medicine at the moment and till the time you can manage it with diet and exercises.
As far as slight increase in fasting sugar level level,after bath,is concerned ,it is normal.
When a person gets up in the morning,a slight surge in blood glucose
is normal and it happens due to more dumping of blood sugar in blood from the liver
You must keep dieting and do regular exercises and keep monitoring your blood sugar at regular intervals.
It is very important for you to keep your blood sugar levels normal to avoid micro as well as Macrovascular complications in future.