A client at 36 weeks gestation with a known history of cocai…

A client аt 36 weeks gestаtiоn with а knоwn histоry of cocaine use during this pregnancy presents to the emergency department with sudden onset of severe, constant abdominal pain described as "tearing," a uterus that is rigid and tender to palpation, and dark red vaginal bleeding. The fetal heart rate is sustained at 80 beats/min. The nurse recognizes this presentation as MOST consistent with which condition, and which finding would be considered a late, ominous sign if it develops?