Objective: To analyze the determinants of the occurrence of ectopic pregnancy (EP) in Brazzaville. Patients and Methods: This was a retrospective cross–sectional analytical study of women admitted to gynecological emergencies. Included were records of women whose diagnosis was an EPG in Group 1 and records of immediate postpartum women in Group 2; records of women operated for EP or delivered in other health facilities and referred to the UHC for complication management; and records that were unusable. Results: The risk factors for the occurrence of EP were as follows: sexually transmitted infections (97.4% Odd ratio 3.93), EP history (20.5% OR 4.14); multiple sexual partners (89.7% OR 1.97), ages at first intercourse greater than or equal to 18 years (41% OR 2.76), and menarche age between 16 and 18 years (64.1% OR 2.02). Conclusion: The determinants in the occurrence of EP are not always superimposed on each other. Those in the West in Africa.