A 35-year-old woman at 12 weeks gestation undergoes non-invasive prenatal testing (NIPT), which reveals a high risk for trisomy 21. Due to her advanced maternal age and abnormal NIPT result, she undergoes invasive prenatal testing. Findings: Amniocentesis: Fetal karyotype is normal (46,XX). Placental Tissue Analysis: Mosaicism for trisomy 21. What is a common maternal complication associated with confined placental mosaicism (CPM)?