Will I need chemo? (100% embryonal carcinoma)

Oncologist appointment is still a few weeks away. Got the right winger removed a couple weeks ago and I had a few trips planned for this year. Biopsy came back 100% embryonal carcinoma (an agressive one, my urologist said) with free margins which I know is positive, also no spread and all scans came back clean. Caught very early on with no symptoms other than the lump. Question is, as the title says, will I need chemo? Will it fuck me up hard, even if it's "just" one cycle? What are the odds the oncologist just chooses to watch and wait for the time being? My younger brother died of cancer (unrelated to TC, other stuff on the brain) and I know how shitty chemotherapy can be.

Edit: No LVI detected and no invasion on rete testes either. The size was 12,00x8,0mm.