Which of the following is NOT a risk factor for ectopic pregnancy?

High blood pressure is not recognized as a risk factor for ectopic pregnancy. Ectopic pregnancies occur when a fertilized egg implants outside the uterus, most commonly in the fallopian tubes. The primary risk factors typically involve conditions or situations that affect the fallopian tubes or the reproductive system's overall function.

Previous pelvic infections, such as pelvic inflammatory disease (PID), can lead to scarring and damage to the fallopian tubes, making it more likely for a fertilized egg to implant inappropriately. Endometriosis can also cause similar issues as the endometrial cells grow outside the uterus and can lead to structural abnormalities in the reproductive organs, increasing the chance of ectopic implantation. A history of surgical procedures on the fallopian tubes, such as tubal ligation or tubal surgery, can create adhesions or alter the normal passage for the egg, further elevating the risk of ectopic pregnancy.

In contrast, high blood pressure does not directly influence the location of implantation nor the structural integrity of the fallopian tubes or the reproductive system, making it unrelated to the risk of an ectopic pregnancy.