Hi there, everyone is different and we all make our own decisions based on our own experiences. I had a recurrence in the same breast (I originally had a lumpectomy), thankfully it had not spread to anywhere else in my body as Robyn mentioned can happen. However both my cancers were like Chris's not detected early in mammograms. One was 8 months after a clear mammogram and the other 6 months. This was my main reason for opting for the prophylactic mastectomy of my other breast. My breasts were very dense and did not image well. I was so fortunate to have found both my lumps and didn't want to risk missing any new cancer in the other breast. The risk is low for a new primary but in my case I thought due to imaging problems it was something I didn't want hanging over my head.
I have certainly never regretted the decision. gather as much information as you can, talk to your Drs and breast care nurse, and then make a list of the pros and cons and this will certainly help with your decision making. There is no right or wrong, just what is right for you.
Please check your messages as I sent you one regarding your request to join the online group.
Good luck with the rest of your chemo, you are so young and with a young family as well... Be kind to yourself.
Paula xxxx