Ectopic pregnancies occur when the fertilized egg implants somewhere outside of the uterus. The vast majority of ectopic pregnancies implant in the fallopian tubes, where the implanted embryo burrows actively into the tubal lining. If left unchecked, the fetal growth will affect nearby tissue and vascular structures. Fallopian tubes can break if stretched too much by the growing pregnancy — this is sometimes called a ruptured ectopic pregnancy, one in which the fallopian tube gets torn or bursts and results in internal bleeding. Sadly, no medical technology currently exists to move an ectopic pregnancy from the fallopian tubes to the uterus.