Ttc baby #1

Hello my name is Candee my fiance and I have been trying for 3 years or better. Before I met him I was the depo shot for 6 to 9 years... I stopped the shot and all bc after I had to have LEAP procedure done July 2013, I have not been on any bc since then and I still can not get pregnant I do have irregular periods, roughly very 3 to 4 months I have a period. Recently I had my period and now I am really tracking my fertility days and today is the highest and we did have intercourse... what are the chances of becoming pregnant after being on the depo shot for that many years?