Dear @Mags44
It’s a lousy time for feeling sure about anything, isn’t it? Very little is normal and in addition to everything else, you have had news of your father’s diagnosis which is additionally upsetting.
But you have been firm on your path for several months and have had time to determine how you feel about your medical team. If you are still confident in their guidance and advice, then perhaps there is no new or vital reason to change your course of action. The current climate of uncertainty may be the dominant factor, understandably, rather than any change in your diagnosis or prognosis.
At some stage, we all have to accept that there are no absolute guarantees about safety, now perhaps more than ever before.
I had a slightly different diagnosis, immediate surgery then chemo. My choice was a partial mastectomy but with strong recommendation to a full mastectomy. That choice still leaves the potential for cancer in the other breast, or somewhere else.
Little by little, I think we all learn to live with the reality that nothing is certain, however well we have planned and conducted our lives. Best wishes for next week whatever you decide.