HHi Sally,
It looks like you are doing good job of trying to optimize your health prior to trying to become pregnant,and that is definitely to be commended. A fasting of 100 mg/dL is just on the borderline of slight abnormality(impaired fasting glucose), as are your post-meal levels in the 150's(impaired glucose tolerance).
I do suggest repeating the glucose tolerance test prior to trying to become pregnant, and also continuing to try to lose some weight.