Any advice? ?

Me and my hubby got together when I was 6 months pregnant with my first little girl. We've been together going on 2 years and still have not conceived another one. We've done just about everything over than going to the doctors. He really wants another baby. And I feel bad because we don't have a child together although he takes wonderful care of my daughter and claims her as his own. Any advice? I don't know of there's some kind of sperm test he can take at home. Any one know any information on that it'd be appreciated. :)