Husband relapsed

My husband was a drug addict for many years before we met. He's been sober for almost 3 years. I'm 24 weeks pregnant and last night he relapsed... I really just don't know what to do. I'm so confused and hurt. I just need advice from people who have been in this situation... Please no negative.. I've already flipped out on him and told him how I feel. I just need advice as to where to go from here.. He's a good man... People make mistakes right? Idk...