Candy Gal, I think it is best if you and your hubby go for a full body check up. It is better to know early where the problem lies and determine the best course of action. 2 years of trying is kind of long. Maybe you can persuade your hubby to go by making the whole visit to doctor sound casual. dont't give him too much pressure.
I dont't really know specific ways to increase the chance of pregnancy but you might want to buy a ovulation kit. Make sure you have sexual intercourse during your ovulation period.