Well, if you are shooting T, your testicles will shrink. I believe HCG can help with that.
Alternately, SERMs can, in some cases get your pituitary to tell your testicles to produce T. Your labs from before you started TRT could be helpful in identifying if you are primary or secondary hypogonadism. Seems that many doctors, if they are familiar with TRT at all, go straight for T injections, which isn't always the best course of action.
You should be testing your E2 levels too. T converts to E2, often after T levels are corrected, E2 goes high and causes other problems. An AI could be needed.
Good luck, read the stickies, welcome aboard.