A 16-year-old sexually active female patient with a history of pelvic inflammatory disease (PID) presents to the emergency room with complaints of sudden right-sided lower abdominal pain and gastrointestinal distress. She cannot recall the date of her last menstrual period, but states she knows that she’s “late.” Her exam demonstrates a unilateral, right adnexal mass. The nurse knows that this patient likely has which of these prenatal complications?