@joannemm30809 the answer to your question is it depends. There are many types of chemotherapy, and many different protocols for radiation. Without a treatment plan there really isn’t any way to answer that. I understand your biopsy came back positive for IDC. ER+ and PR+ Her2-, is that correct?
Usually (not always) the natural progression would be a referral to surgery for lumpectomy or mastectomy, you definitely get to help decide which one, doctors will give you the best recommendation but the final vote is yours.
When it comes to cancer they are risk managers, they try and help you avoid the risk of recurrence or metastasis. With that in mind they will, using assorted tests and metrics try to reduce your risk as low as possible. The worse your cancer is at diagnosis the harder it is to acceptably reduce the risk.
They will be looking at stage, size, location and type and grade of tumor. Then if there is node involvement and your age and overall health, sometimes more scans and other types of testing to see if you even need chemo or radiation, many women get away with just surgery these days.
Have you gotten a referral for surgery yet?