Standard of Care (SOC): For Arm 1 of the pilot trial, SOC will be implemented. SOC for PWLWH in Kenya is carried out according Kenyan National Guidelines and includes integration of antenatal care, HIV care, and HIV-exposed infant follow up within the maternal-child health clinic through 18-24 months postpartum. Provision of ART, HIV education, and adherence counseling is routinely provided. Psychosocial support is provided by either peer educators or lay health workers. WLWH who miss visits are followed up by phone and then traced in the community to encourage return to care.

PWLWH undergo routine VL testing six months after ART initiation or at confirmation of pregnancy if already on ART. VLs are performed every six months through breastfeeding.

Women with VL 200 copies/ml undergo enhanced adherence counseling with repeat VL in three months. While routine screening for IPV and depression are recommended per National Guidelines, they are incompletely implemented.

For Arm 2, the investigators will implement the adapted PM+ utilizing the complete manual of operations and adaptation lessons learned in the non-clinical trial portion of the study. The investigators will train mentor mothers to serve as PM+ Helpers. In-person sessions will likely be delivered at home. Sessions will continue after the birth if not completed during pregnancy. PM+ Helpers will debrief regularly on the progress of participants with clinically trained supervisors - both for their own psychological well-being and to ensure that participants receive adequate care.

For Arm 3, the investigators will implement the adapted PM+ utilizing the complete manual of operations and adaptation lessons learned in the non-clinical trial portion of the study. The investigators will train mentor mothers to serve as PM+ Helpers. In the mHealth delivered version of PM+, PM+ Helpers will conduct PM+ virtually after an initial meeting to create rapport. Sessions will be delivered by either 1) a PM+ Helper- initiated phone call or 2) a participant-initiated call via a call-in help line. Airtime will be provided so that participation will be free of charge. Sessions will continue after the birth if not completed during pregnancy. PM+ Helpers will debrief regularly on the progress of participants with clinically trained supervisors - both for their own psychological well-being and to ensure that participants receive adequate care.

PM+ sessions conducted in-person by mentor mothers

Failure will be outcome of a missed visit (>30 days) OR treatment failure (elevated VL>= 200 copies/ml among PWLWH assessed through medical records from baseline to 6 months postpartum.

Depression score is calculated and severity assessed through a survey utilizing Patient Health Questionnaire Depression Scale (PHQ-9). PHQ-9 score is obtained by adding score for each question (total points). Total score of 0-4 suggests none to minimal depression severity, score of 5-9 mild depression severity, score of 10-14 moderate depression severity, a score of 15-19 moderately severe depression, and a score of 20-27 severe depression.