We STILL aren't pregnant!

My husband and I have been together for 4 years now. We have NEVER used any form of birth control. We have now been actively TTC for almost a year and nothing. About two years ago I went tp the gyno to see if there we're any issues and nothing.As for the husband he keeps putting off going to the doctor. It's to the point where it's getting depressing. Any advise on getting him to go in?