Hi GF, welcome. Congratulations on your pregnancy. Thanks for reaching out for help. I'm so sorry you're going through this but I'm very glad you're here, as I know you'll get great support.
I have no experience of being in a relationship with an alcoholic and I don't know much about relationships in general so I can't offer any advice but other posters will be along really soon.
In the meantime you may want to also check out the
Friends and Family of Alcoholics - SoberRecovery : Alcoholism Drug Addiction Help and Information forum, where many people will understand what you're going through and you might see lots of posts you identify with.
I hope that your partner does eventually seek help for his alcoholism one way or another. I hope that you and your daughter find peace of mind and that you bring your 2nd child into the kind of world you want to bring him/her into.