Hi Ruby123,
Welcome to the Forum, where you will get good advice and read the other stories, people in the same situation.
I must first of all tell you that YOU are not the problem, never believe that you are, they blame everybody apart from themselves.
Being an addict to drugs/alcohol is a serious illness, but they can get help if they want it, but only if they want it.
There are on line meetings every day, which is a good place to start.
Having a baby must be so worrying for you at the moment, but just concentrate on you and the baby.
Just know your not alone in all of this, keep talking on here, take care.
Dx