My husband gave me Chlamydia

I've been with my husband for 14 years, we have 3 children, and I'm 11 weeks pregnant. I just found out I have Chlamydia. He tried denying at first, then confessed to a night of drinking and drugs and had a one night stand. I'm lost and hurt and not sure what to do. He is in tears and terrified he hurt the baby. I have been thinking a lot and we might be able to get passed this; if it was more of an affair and emotional I think it would be harder. Any advice? True advice, please.