Hiya Bon Bon. I initially had a lumpectomy chemo and radiation. My lump was 3cm and aggressive, also 8 mths after a clear mammogram. Unfortunately 6 months after all treatment completed I had a recurrence. Also aggressive and 3cm and also not detected on a mammogram 6 mths earlier. Of course I had a mastectomy, I wanted both off and a reconstruction, however at the time it was decided chemo was more important. My Dr told me if I still wanted the other breast off then to do it at time of reconstruction. So I had a couple of years of weighing up pros and cons. I did eventually decide to have the other breast off. The main reason was that my cancers were not detected easily with mammograms. I have no regrets, however I do really miss the sensation of my breasts ( the fake ones are numb).
You can only weigh up your pros and cons and make your decsion based on this. You are definitely not vain wanting to reconstruct. It is a personal decision and whatever you choose is right for you.
Joining the choosing breast recon group will as @Cosette_BCNA mentioned give you access to some photos etc and other women who have had reconstructions.
Hugs.
Paula