Need advice

Me and my husband have been together 3 years and have been trying to conceive for 2 years. Were recovered addicts and currently in treatment. We don't know if that's the problem or if it is one of us. If anyone has had the same problems as us please let us know. I hope nothing is wrong with one of us. We actually argued over it for the first time the other day. I feel as if he would leave me later on down the road if I can't have children.