A 27-year-old woman complains of sharp pain in her lower abdomen and dizziness. Her last menstruation was 2 weeks ago. HCG test results are negative. Objectively, her skin is pale, blood pressure pressure-80 -80/60 mm Hg. pulse -92/min. The abdomen is tense, painful more on the right in its lower segments Vaginal examination detects normal sized uterus, the appendages are painful to palpation, the posterior fornix overhangs. What is the most likely diagnosis in this case?