Blood work intervals depend on many factors that your doctor should discuss with you, such as what point you are at in your hormone replacement treatment, other potential health factors, and so on. The intervals will probably also change as you progress in your treatment.
I like to give people the benefit of the doubt when they ask questions since it is so easy for people in the health care industry to try and make a quick buck (or hundreds) off of patients like us since we are pretty much locked into long term care and have little choice but to go with what they say. I've had it happen to me and the health care "professional" literally got hundreds from me in copays alone and who knows how much from my insurance before I was told by someone else that it didn't seem right and got a second opinion.