A 28-year-old woman presents to the emergency department with sudden onset of severe lower abdominal pain on the right side, nausea, and vomiting. She describes the pain as sharp and constant. On examination, you notice that she has a fever of 100.8°F and the abdominal pain is localized to the right lower quadrant, with rebound tenderness. She mentions that the pain started during her morning run and has progressively gotten worse. Her last menstrual period was two weeks ago and was unremarkable. What is the most likely diagnosis?
Ectopic pregnancy
Ovarian torsion
Ruptured ovarian cyst
Appendicitis