If you want a bilateral mastectomy and the medical team only feel only one breast needs to be removed, then you will most likely have to push for it. We had another member here who I and a few others supported and stressed the importance of her telling her medical team that psychologically she will not cope with only one breast being removed!
I cannot recall who it was now, but you may come up against resistance for them to remove a perfectly healthy breast unless you stress you will not cope well otherwise, if that is the case for you.
It is great that your husband will be there, but it will be you that needs to persuade them to remove both breasts if that is what you want.
All the best and I hope you have all the love and care you need surrounding you. xx