Open-label, two-arm, randomized multicenter study to investigate the safety, tolerability, and pharmacokinetics (PK), and potential interactions between dolutegravir (DTG) and rifapentine (RPT) during pregnancy in people with HIV when RPT is given with isoniazid (INH) daily for 4 weeks (1HP) or weekly for 3 months (3HP) as part of tuberculosis (TB) preventive therapy (TPT). Adults (age ≥18) who are pregnant with a singleton pregnancy (confirmed by ultrasound) at a gestational age of 20-34 weeks and virally suppressed on an existing DTG-based plus two nucleoside reverse transcriptase inhibitors (NRTI) antiretroviral (ART) regimen for at least four weeks may participate.