This study is for women who have delivered a child in the past 18 months, have experienced one or more traumatic events during their lifetime, and use substances. First, the research involves completing brief screening questions over the phone to determine eligibility for the study. Second, eligible women will be invited to complete a 60- to 90-minute study visit comprised of an online survey and an interview about their opinions on postpartum substance use and potential future resources to help address substance use among postpartum women with trauma histories.