FCOG-1192

A 32-year-old woman at 37 weeks of gestation, who has been fine antenatally, presented with a history of sudden onset of severe abdominal pain with vaginal bleeding, and cessation of contractions after 18 hours of active pushing at home.

On examination, she is conscious and pale.
Her vital signs include blood pressure of 70/45 mm of Hg and a pulse rate of 115 beats per minute which is weak.
Her abdomen is irregularly distended, with both shifting dullness and fluid thrill present. Fetal heart sounds are not audible.

What will be the most likely diagnosis?