An ectopic pregnancy is a pregnancy that occurs outside the womb (uterus). It is life-threatening to the mother.In most pregnancies, the fertilized egg travels through the fallopian tube to the womb (uterus). If the movement of the egg is blocked or slowed through the tubes, it can lead to an ectopic pregnancy.The most common site for an ectopic pregnancy is within 1 of the 2 fallopian tubes. In rare cases, ectopic pregnancies can occur in the ovary, abdomen, or cervix.