A hba1c of 100 is equivalent to an average blood sugar of 15.4. So what are you currently doing to control your blood sugar, if anything? Do you test your blood sugar? If so, when do you test? What insulin regime are you on? Do you carb count? Have you done any basal testing recently? Have you done any checks to see if you're using the right insulin:carb ratio? Do you know what your correction factor is and do you correct for highs?
Ladies with type 1 are advised to aim for a hba1c under 48 before trying to conceive.