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Ectopic pregnancies primarily occur in the fallopian tubes, accounting for approximately 95% of cases. This location is critical to understand because the fallopian tubes are where fertilization typically takes place. When a fertilized egg implants outside of the uterine environment, it often does so within the fallopian tube due to anatomical and physiological factors.

Recognizing this is crucial for early diagnosis and management, as an ectopic pregnancy in the fallopian tube can lead to rupture and significant internal bleeding, which is a medical emergency. The other options represent sites where ectopic pregnancies can occur but at a much lower frequency. For example, while an ectopic pregnancy can occur in the uterus (though that's typically a normal pregnancy), it’s not classified as ectopic in the same sense, as a properly placed intrauterine pregnancy is the intended result. Ovarian and cervical pregnancies are even rarer, making the fallopian tube the most pertinent location for understanding and diagnosing the vast majority of ectopic pregnancies.