Husband wants a divorce

My husband of only 5 months wants a divorce and I'm 5 months pregnant.. I'm heartbroken.. today is my 5 month scan to find out the gender and he didn't show and tell me this right before my appt.. i came in with tears in my eyes trying to hold back tears.. his reason.. alcohol comes before me, my kids, and our unborn baby.. our only issue in the relationship has been about his behaviors while drinking.. any words of encouragement would help.. I'm feeling really low at the moment..