I noticed more peach fuzz on my upper lip within a week of starting T (ironically, my mustache is nothing at all to write home about two years later). I started experiencing various forms of vocal weirdness right away as well -- a tight/sore throat, cracking, that kind of thing. None of this was dramatic enough that other people would have noticed, but it caught my attention. I'm sure the placebo effect came into play like some others have mentioned, but really, HRT is such a crazy crapshoot and highly individualized experience. There's no universal way that it manifests in the early stages.