What's the next step?

So I'm currently 4 months pregnant with my first and I just found out today that my husband has been smoking heroin for the past month. He has struggled with painkillers in the past but nothing as serious as this. He needs help but I don't know anything about rehab or detoxing or things like that other than he's already got flu like symptoms. Where do we go from here? We had a vacation planned for a week in 2 weeks, thinking of cancelling to get him into a treatment of there is such a thing as like a 4 day inpatient thing. I just don't know what to do. Anyone been through this? Any advice on how to get him the help he wants and needs?
***UPDATE*** my husband has gone through detox and has been clean for a little over a month. He says having me there to talk to openly about the whole thing has made him realize that he isn't in this alone and was foolish to ever feel that way. Obviously I'm still wary and watchful but he has been honest with me about every urge or text from a dealer/user (whose numbers he has now blocked) I don't want to get too spiritual but I believe in God and that everything happens for a reason and while it was heartbreaking to go through I feel stronger and closer to my husband than ever. I'm so thankful that we found the strength to overcome this together. I believe love is loving someone despite their flaws and imperfections (as long as it is a safe environment of course) which now it is THANK GOD!

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