Recording is sensible - as is asking for information in writing, many oncologists can provide written information on treatment, side effects etc. Both are useful for checking later, explaining to others and so forth.
My partner came with me for my biopsy results and for my first meeting with my oncologist. I might have valued him being there for my first chemo, but I ended up having it in hospital anyway (nothing serious) so plenty of support! Otherwise I preferred to go on my own. I tolerated chemo pretty well, worked throughout and liked having some relatively quiet time on my own. Everyone’s different, the important thing is to do what you find best for you!