Sorry to hear about your bc diagnosis but welcome to this network.Your first breast biopsy via fine needle or core procedure only tells you whether it's cancer or not. You will get detailed pathology after your surgery which also determines your treatment.I've had breast cancer twice and this happened each time.I've had a mastectomy and wear a prosthesis in my bra.To tell the truth,I just wanted the cancer gone as quick as possible and didn't think about the other breast at the time.I think if you have large breasts then being lopsided might be annoying- I'm a c cup so it's not too bad.Still having one breast with sensation might need consideration with regards to intimacy.Yes,it can be abit uncomfortable to lie on the mastectomy side in bed.Lots to consider but if in doubt,just have one breast taken now.You can always have the other one taken later or reconstruction later. There is no right or wrong decision- all bc decisions are awful!! Keep asking questions and then go with what feels right for you NOW. Big hug, Tonya xx