Help! Pregnant and husband told me last night he doesn't want our baby.

I am 18 weeks pregnant and after dinner last night my husband picked an argument over a small bill. The argument escalated on his end and then in front of our six year old little boy, he announced he didn't even want another baby. My six year old was devastated and apologized to me because of the mean thing daddy said. (No child should ever be put in that situation, and my son desperately wants a sibling) My husband then stomped off and didn't speak to any one for over 3 hours as if he is the victim. He tried to apologize as I drifted off to sleep last night, but I wasn't at a place where I could talk to him about it. I didn't want to say something I might regret. I have felt completely devastated, alone, and depressed today. Every little thing makes me cry. Any advice would be greatly appreciated?