Participant timeline {13}
The overall participant timeline is illustrated in Fig. Week 1 (T1): Participants of the P3 Cohort study will complete a baseline assessment during pregnancy (less than 27 weeks GA). Individuals who are eligible for this study will be identified and will be contacted by a member of the study team to be invited to participate. The study team member will outline the study protocols and obtain informed consent.Week 2: Participants will be randomly assigned, using computer-generated block randomization, into the intervention group or the standard of care control group.Weeks 3–6: Participants randomized to the intervention group will complete the BA counselling sessions with a peer counsellor via telephone, in addition to regular informal peer-support contact. Participants in the control group will continue to receive standard of care.Week 8–10 (T2): At 34 to 36 weeks gestation, after the completion of the intervention, all participants will be invited to complete an electronic P3 Cohort questionnaire.Post-due-date (up to 6 weeks postpartum): After childbirth, information about gestational age at delivery will be collected for the P3 cohort via linkage to the participant medical record. Participants will continue to have informal peer-support (social support, advice, information sharing) contact with peer counsellors via text and telephone, up to 6 weeks postpartum.Five to 6 months postpartum (T3): All participants will be invited to complete an electronic questionnaire as part of their participation in the P3 Cohort.Eleven to 12 months postpartum (T4): All participants will be invited to complete an electronic questionnaire as part of their participation in the P3 Cohort.