This study involves testing how useful a technology-enhanced intervention is for pregnant people prescribed buprenorphine for the management of opioid use disorder. The intervention being studied is a brief therapy protocol and a mobile application. Participation involves four 60-minute biweekly (i.e., once every other week) therapy appointments during pregnancy, and three 30-minute therapy appointments monthly during the first three months after childbirth. The mobile application will be accessible for at least the duration of the study. Participants will also be asked to complete questionnaires at enrollment and again at 1-month postpartum and 3-months postpartum, and will be contacted approximately once a month to conduct a medication count. The total duration of the study is 6 months. Compensation is provided.