when will 1st post op mammogram take place

Hi there


it has been over a year since I had left side mascetomy with reconstruction. I had six month follow up in Oct 2017 where further reconstruction was discussed for right breast which is now larger than left breast op will take place if all goes well in April. 


When should first mommogram take place. March year after op or in October year after 1st follow up appointment. No good asking my GP because you will be asked why you want to see GP. I had to wait til Thursday to phone for an appointment and get grilled again and even then you are not guaranteed one if is not deemed urgent and you will have to go through the process all over again. (I only got referred through mammogram screening)