Drifting from husband??

Is anyone else feeling a rift in their relationship? My husband has been trying his best to take care of me while I'm pregnant, but he stresses about money constantly, even though we are financially fine. He is excited about baby and talks to her and tells her he loves her, but every time I mention anything about preparing for the baby's actual arrival he clams up and gets all stressed. I'm trying to be patient, but every time I try to make a suggestion to help him relax he shoots it down and I'm getting sick of it. We've been together a long time and we were rock-solid before I got pregnant. I'm sad, feel alone and frustrated. Any advice?