Husband Stopped Testosterone Replacement Therapy

Any women with experience dealing with their partner stopping TRT and how long it took for their sperm count to regain? And if you got pregnant once he stopped? If you did conceive, did it happen naturally or did he have to take something else to counteract the testosterone?

I am a firm believer that TRT is in fact male birth control.. zero sperm count while on it. Lots of studies done on it, and mine was on it for years.

Any insight would be appreciated, thank you.