Bringing sperm count up with HCG while on TRT

My husband has been on Test for 10 weeks. He takes it for bodybuilding, not because of low T. He is a young healthy male otherwise and has never had low T. Our first pregnancy, I got pregnant the first month off birth control so I know he was fine then. I’m wondering how this will affect our plans of getting pregnant. I’ve heard that test is basically like male birth control as it decreases or stops your natural production. Does anyone have any experience with this? He will be on Test for 6 more weeks and then will come off it. I’ve read that they can take HCG during their cycle to increase sperm count and then take Clomid after. Anyone have any experience with this? I’m not even sure how much damage can be done to his sperm count in 16 weeks?