Get yourself to a meeting or something. or keep posting here.
I'm sure one incidence of alcohol did nothing to your baby but you need to prevent it from happening again.
I also struggled with drinking during my second pregnancy. I had a few a few times during the pregnancy after not even touching caffeine or anything remotely harmful for the first one. Definitely an indicator that this was getting out of hand for me. My son is fine but you can't risk it.
Tell your husband how serious this is...he will join you in not drinking if he knows how important this is to his unborn baby's health I'm sure.