Elena Gilbert in the books does not have children,as in the series.So,maybe you thought of Nina Dobrev who plays Elena in the series - no she hasn't got any children.
The uterus is part of a woman's reproductive system that is located in the pelvis between the bladder and the rectum. The uterus is the hollow, pear-shaped organ where a baby grows. The narrow, lower portion of the uterus is called the cervix. The broad, middle part of the uterus is called the body, or the corpus. The dome-shaped top of the uterus is called the fundus. The fallopian tubes extend from either side of the top of the uterus to the ovaries.
An ectopic pregnancy can develop in different locations . In most ectopic pregnancies, the fertilized egg has implanted in a fallopian tube. In rare cases: The egg attaches and grows in an ovary, the cervix, or the abdominal cavity (outside of the reproductive system ). One or more eggs grow in the uterus, and one or more grow in a fallopian tube, the cervix, or the abdominal cavity.