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.
Ectopic (out of place) pregnancy occurs when the fertilized egg develops outside the uterus. The most common location of ectopic pregnancy is in one of the fallopian tubes (structures that extend about 41/2 inches from the ovaries to the uterus and through which the egg travels from the ovary to the uterus).