Which of the following is LEAST likely to increase the risk for ectopic pregnancy?

Risk Factors for Ectopic pregnancy - Prior tubal damage, either from a previous ectopic pregnancy or from tubal surgery to relieve infeility or for sterilization, confers the highest risk for ectopic pregnancy. After one previous ectopic pregnancy, the chance of another is approximately 10 percent. Pregnancy after Infeility treatment "Atypical" implantations--cornual, abdominal, cervical, ovarian, and heterotopic pregnancy--are more common following A procedures. Peritubal adhesions subsequent to salpingitis, postaboal or puerperal infection, appendicitis, or endometriosis may increase the risk for tubal pregnancy.