RecruitingPhase 3Drug trialA Study of Nipocalimab or Intravenous Immunoglobulin (IVIG) in Pregnancies At Risk of Fetal and Neonatal Alloimmune Thrombocytopenia (FNAIT)The purpose of this study is to assess the efficacy and safety of nipocalimab in reducing the risk of severe fetal and neonatal alloimmune thrombocytopenia (FNAIT).