Definitely worth checking in with a nurse sooner rather than later depending on what comes next for you. The 'jiggly' bit sounds like my ongoing seroma I got and still have 8mths later. Although potentially not problematic and may resolve by itself over time, depending on what treatment you have next it might be important to get it some attention before you start, e.g. I had to have mine drained and let it settle a little before they took my radiation treatment chest mapping. Your situation could be completely different to me though so worth talking to a nurse - be it a breast cancer navigator/Glen McGrath nurse, your surgeon's nurse you had available previously or ask to chat to one where you are doing treatment to see if it could pose any issue.
