I'm sorry for your worry. There is also a Triple Negative group here that you can join. And a young women's group. Maybe they could be helpful.
I've had Mastectomy with delayed Reconstruction. I was stage 2 Grade 3 on diagnosis, Estrogen positive. I was not given the option of observation. Your concern re body image is understandable. Have you asked to see photos from your surgeon, of other similar patients.
My new boobs are not the same as the old ones. But mine were older than yours, and probably not as attractive. Because of the Radiotherapy I had after Mastectomy and Chemo, my Recon options were limited. I had a Latisimus Dorsi and a Prophylactic mastectomy. I now have Implants ( after having had expanders). I have no nipples, but do plan to get nipple Tattoos. I am happy with my choice.
It can be a difficult decision.
Do I understand that you have a planned Lumpectomy? Is that definite and then observe?