I agree with the above posters, about communicating and trying a marriage counselor. Im in the same situation, no kids though. I sat down with my husband and told him what I thought about our current situation, and how I wouldn't want to have children if our marriage is not strong and healthy. It's always best to talk. We are doing much better now, but there is still some progress to be made.
Feel free to email me, my name is Miriam