You are surprised by this? your LH and FSH is shut down when you are on TRT.
One option is - You can take HCG to restore your testicle size for a few weeks, then come off, and restart your natural T with a Clomid restart protocol and you should if everything is working in order be able to get your mrs pregnant in a few months.
You can stay on TRT and increase LH and FSH too but I am unfamiliar with what to take here, someone else may be able to help, but it is possible, I know HCG will increase LH but you also need FSH for sperm production and health.
You want healthy sperm if your making a baby
I found a thread with info you may want - Sperm Test Results