Dbl or single masectomy? public health

Hi, ive been diagnosed with dcis in left breast Aug 2026, but breast specialist says likely invasive too as its large, will need masectomy and probably need radiotherapy after too. Right has shown something of concern but cant get in for a biopsi via mri for 2 weeks but need to make decision asap as they want left off. Do i get left off and wait for right biopsi results, or get both off now? If i get right off without mri they say unlikely to get sentinol node biopsi done too yet i saw a private reconstruction specialist who has recomended both the sentinol nodes to be biopsied during  bi lat masectomy and has helped inform my decison for a dble masectomy in terms of reconstruction outcomes, individual risk factors etc.  I know if the results come back invasive cancer in right it will be hard to do biopsi of sentinol node and likely need all nodes stripped which can lead to lymphodema and those issues.  Amyone else have any ideas? Public system challenges?