Testosterone injections for hubby

Julie
We have been off Bc for 3 years. I've been to a reproductive endocrinologist-I'm just fine. I should add I have a 9 year old. 
Hubby wouldn't do the Semen analysis then(2 years ago) 
He has now been diagnosed with low testosterone (250) was his last lab result and he's 34...should be around 700-900. Anyway he got an injection today and will every two weeks.
Will this help or hurt fertility?
He is also finally getting the full semen analysis work up.