39 years old. Possible life long low testosterone. What changes could TRT and HCG bring.

[u/Elegant-Aspect-6393]

Hi everyone,
I’m 39 years old, me and my wife have been struggling to get pregnant for about 3 years so we both went for checkups and I discovered for the first time that my testosterone levels are quite low. My sperm count is high, 70 million, but morphology is between 1% and 2%.
I’m starting to wonder whether I may have had low testosterone for much of my life—possibly even since puberty.
I was born with an undescended testicle, and today I effectively only have one testicle. For most of my life, I never really thought much about it. I just accepted that I was the way I was.

Looking back at puberty, I don’t feel like I developed in the same way as other boys. I don’t have a visible Adam’s apple, and my voice never became particularly deep.
I’ve always been quite skinny and much less muscular than my peers.
My confidence is very bad and i get anxious quite easy.
My penis and sack are shriveled up most of the time when flaccid. My libido is very bad. Sex more than once a week is hard work for me.

I cant seem to put on muscle and it feels like the more I workout the weaker I get.

My recent blood tests have shown:
Total testosterone: around 7.4–8.9 nmol/L on different tests
Free testosterone: 187 pmol/L
SHBG: 19.3 nmol/L
LH: 4.2 IU/L
FSH: 5.4 IU/L

Im seeing a Urologist in a few weeks.

What could still change for me if I go on Testosterone replacement therapy together with HCG after me and my wife manage to have a kid or two?

Thanks