I was in a similar situation back in September 2016 when I was diagnosed with triple positive in the left breast and with node involvement. I also had chemo first and had to push my surgeon to remove both for much the same reasons as you've stated....I did not want a 'rinse and repeat' of the shitfest of chemo which had resulted in me being hospitalised for a total of 57 days and nights over the four AC chemo doses due to terrible side effects. I too was told that the risk of cancer recurring in the other breast was negligible, and that if it came back, it would most likely do so elsewhere, such as the liver, lungs or bones. When I raised the question of a brand new, totally unrelated to the existing left sided breast cancer, occurring in the right breast in the future, I was told that that statistic was 1 in 8....now I gather that the figures are 1 in 7. I was told that just as with a coin toss...the chances of either heads or tails on any particular toss were 50/50...even if you had tossed three heads in a row, the chances of the next toss were still 50% that the next toss would be heads again. The fact that I was one of those 1 in 8 this first time around was no guarantee that the Cosmic Clowns wouldn't bite me in the bum again for the right one at some time in the future. I insisted on both being removed. I have no regrets at all. Good luck with your own choice and treatment.