Development of a Lifestyle Physical Activity Intervention to Reduce Risk for Perinatal Cannabis Use

Inclusion Criteria: * Women aged 18+ * 12-25 weeks gestation with a healthy singleton pregnancy * Medically cleared for moderate physical activity * Self-report of cannabis use at least once/week in the 3 months prior to the pregnancy desire to not engage in prenatal cannabis use * Elevated depression (EPDS\>=7) or anxiety (GAD7\>=5) * English-speaking * Owns a smartphone to enable use of the Fitbit app * Current physical activity does not meet health recommendations (150 min/week mod intensity activity) * Expresses interest in reducing or discontinuing cannabis use Exclusion Criteria: * Current DSM-5 diagnosis of moderate/severe substance use disorder other than CUD or nicotine use disorder * Use of illicit substances in the last 3 months (other than cannabis) * Acute psychotic symptoms * Current or recent suicidality or homicidally * Current anorexia or bulimia * Cognitive impairment * Physical or medical problems that would not allow safe participation in moderate intensity PA (i.e., not medical cleared by Ob/Gyn) * Has a plan to relocate away from the area during study period * Recently started new mental health or substance use treatment within past 4 weeks.