Drugs and alcohol on his side. Baby expected in August. I don't want anything to do with him

Well, I'm two months pregnant. My husband left me yesterday. I am married by marriage. In Arizona. Drugs and alcohol on his side. Baby expected in August. I don't want anything to do with him. I don't want it to have anything to do with the baby the way he is. Should I file for divorce before the baby is born? After? What rights does he have now

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until he wants to stop drinking and using drugs, the only thing you can do is keep yourself, your pregnancy and the other child safe. get a restraining order so that he cannot be 

near you. If necessary contact Child Protective Services involved to protect rhe other child. Unfortunately you cannot fix the father. Been thru this with 40 year old son. I got restraining order, evicted him from home I let him live in and stopped giving him money. Made him homeless and cut off giving him money. You must do whatever you can just to protect yourself even if you need to contact all public services to obtain all help available. Only he can fix himself.