I’m not sure how this may apply to you as I’m a 24/M, but I’ve seen significant weight gain and minimal size increase since beginning treatment. At this time last year I weighed 129lbs before getting diagnosed. Due to insurance issues I did start taking my meds consistently until this past september. soon after I began a small nightly exercise routine which i’ve been doing consistently and as of now I’m in the 155-160 range, but more importantly there’s been next to no actual size increase (although my muscles feel much denser and firmer), as seen by the fact that i still wear the same 30" pants.
hope this helps