This is a time, a gift, to learn all about your pregnancy and all the needs of a newborn baby. Sadly, it seems your husbands problem has become the main focus- which is not uncommon.
What would this time be like if he wasn't addicted? Where would you put your energies? Make your boundaries and go from there. Being so enmeshed in his problem will only make you sick and won't help him in the least. What are your boundaries and what are your core values in a relationship. If he is not meeting those, it's time to find out why you are accepting it.
I think the more I tried to "help" the better my husband learn to lie, sneak and protect his addiction.