When to get him tested

Heather • Harrison Jacob 4/10/16 💙👦🏼 Samuel David 2/4/19 💙 👦🏼
I've been off birth control for about a year (not being super careful) and we've been actively TTC for about 3 months. I've gone off all medication, cleaned up my diet, stopped drinking coffee and alcohol and am taking prenatals. I've also had a pre-conception appointment where my dr says and I'm healthy and should have no issues getting pregnant. 
At what point do I suggest my husband gets checked out? Another year? 6 months?