An ambulance delivered a woman with a delay after menstruation cramping pain in the right iliac region, radiating to the rectum, bloody discharge from the genital tract. Objectively established: heart rate contractions - 100/min., blood pressure - 90/60 mm Hg. Art. The skin is pale. Stomach painful on palpation, a positive symptom of Shchotkin-Blumberg. During gynecological research is observed: shifts of a neck are painful, the right appendages are increased, painful, back vault overhanging, bloody discharge. Make a preliminary diagnosis: