First Mammogram after Treatment Question

I had a lumpectomy and 30 radiation treatments to address my DCIS this past summer. Tomorrow I am having my first mammogram since I was diagnosed in May. My oncologist said she thought I would only receive the mammo on my affected side this time since that is probably what insurance covers. For some reason, I assumed that they would just do both breasts. I am wondering what other people have experienced and if this is standard. I hate to think about going back again in six months. Enough is enough!