Previously used testosterone

Gl
Hubbs and I are trying to conceive - he was in an accident which injured his baby making parts and caused his natural testosterone to go very low. He had been taking testosterone shots on and off for about a year until we found out that it was considered male birth control. I've read many articles that say it takes 3-6months for sperm to start being produced again (we're about 3 months off and taking a sperm promoting multivitamin) but curious on how this situation has affected anyone else and how long it took you to conceive after stopping. Thanks!