When radiotherapy has finished how soon will I have my mammogram

I was diagnosed 24th April 2019 with breast cancer. Had lumpectomy last July, then Chemo and I finished radiotherapy 24th February. Does anyone know when I get a mammogram ? I was told it’s every 12 months, only had one when I was diagnosed. But then I read it’s 6 months after radio ends or 12 months after radio ends. It’s hard to get any answers as everyone is busy with coved 19 

I have heard people say they got the all clear or had a mammogram and it was ok ? 

I am taking Letrozole for 5 years and my Herceptin was stopped because of covid , just be nice to know the treatment had worked so far .

thanks in advance