Which of the following factors is not an impoant risk factor for tubal ectopic?

Ectopic pregnancy results from various factors that interrupt the successful migration of the conceptus to the endometrium. The most impoant risk factors for ectopic pregnancy are history of tubal surgery, including tubal ligation, for prior ectopic pregnancy, infeility history of prior ectopic: increases risk 5 folds in utero diethylstilbestrol (DES) exposure: causes congenital fallopian tube anomalies history of pelvic inflammatory disease, sexually transmitted disease peritubal adhesions: secondary to salpingitis, endometriosis, appendicitis SIN: salpingitis isthmica nodosa infeility: use of A: increases risk of atypical/ non tubal ectopic failed contraception: IUCD, sterilisation, progesterone only contraceptives. PLEASE NOTE IT IS FAILURE OF THESE CONTRACEPTIVE PRACTICES, AND NOT THE CONTRACEPTIVE PRACTICE IN ITSELF Intrauterine device (IUD) use are associated with reduce pregnancies and reduced ectopic rates, however, if there is a failure of the IUD and a pregnancy results, ectopic gestation is more likely as compared to normal population conceiving These are not very clear relations. Many other risk factors, including smoking and multiple lifetime sexual paners, are weakly associated with ectopic pregnancy .