Welcome to SR.
i have an AS who is also addicted to pot.
i must say that although you, like many of us came here for help, I see so many more signs of healthy behavior from your post than my first post.
I was a basket case when I first found out my son was an Addict. And i spent many years trying to fix him before I realized living with him in my house wasn't a good idea for either one of us.
so you are doing very good!
also, I can understand why your husband would fear the separation. It can be scary. but you letting him know you are still there for him is great. Also knowing he needs to do this on his own is an incredible step for you.
you are doing this for you and that baby.
If your husband wants this recovery bad enough he will work his program. Having a family to work for it is incentive,but he will still have to do it for himself.
If you could get yourself to a program also I would highly recommend it.
Either Nar-Anon or Al-anon are great. you already have so much going for you but these programs will give you the strength, knowledge and support to continue supporting your husband and yourself.
good luck and keep coming back