Worried about my husband

I'm worried my husband is drinking too often. He'll come home from work and drink 4-6 beers a night and won't eat dinner till close to 11pm. I've expressed to him how it bothers me that it's becoming an everyday thing but he doesn't see anything wrong with it and defends why he does it. I'm 20 weeks pregnant and we also have a 13 yr old and 10 yrs old. I've expressed to him how he can't be doing this once the baby comes but I dont see him making any changes. He said he drinks to relieve stress from a hard day at work. And what worries me is that that's the only form of relaxing he does. He doesn't try to any other method. I'm stressed daily but I can't simply go and have a drink because I'm pregnant. I just have to deal with it. Which is the correct way to deal with life. Crutches become habits and I feel like nothing I can say or do will help him realize it. I just wish he took better care of himself. And lately when I talk with him, he thinks all I'm doing is trying to make him feel guilty. It's definitely becoming a problem because he gets annoyed when I bring it up. I find myself feeling disappointed in him and angered. I don't know what to do anymore to help open his eyes.