A 28-year-old woman presents with 8 weeks of amenorrhea, lower abdominal pain, and vaginal spotting. Serum β-hCG is 15,000 mIU/mL. Transvaginal ultrasound shows no intrauterine gestational sac, but a 3 cm mass is seen in the left fallopian tube with free fluid in the pouch of Douglas. Regarding ectopic pregnancy, all of the following are true EXCEPT:

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