Ectopic pregnancies are referred to as:

1. Implantation of embryo at site other than uterus.
2. Implantation of defective embryo in the uterus
3. Pregnancies terminated due to hormonal imbalance.
4. Pregnancies with genetic abnormality.

In ectopic pregnancies, the implantation of embryo does not occur in uterus but at other site.