voice dropping in my first week?

hi everyone! i’m a 20 year old trans guy who started T (androgel, 2 pumps a day) exactly 7 days ago. i’ve always been told that it will most likely take a few weeks to months for your voice to noticeably start to drop, but is it absolutely impossible for your voice to start changing this soon?

my voice has started to sound so much deeper and raspier that my mom, who’s around me 24/7, pointed it out lol.

are we all just imagining things or is it not impossible to notice voice changes in your first week?