In the case of an ectopic pregnancy, the fertilized egg doesn’t attach to the uterus. Instead, it may attach to the fallopian tube, abdominal cavity, or cervix. While a pregnancy test may reveal a woman is pregnant, a fertilized egg can’t properly grow anywhere other than the uterus.
A heterotopic pregnancy is a rare complication of pregnancy in which both extra-uterine (ectopic pregnancy) and intrauterine pregnancy occur simultaneously. It may also be referred to as a combined ectopic pregnancy, multiple‑sited pregnancy, or coincident pregnancy.
Ectopic Pregnancy: Symptoms, Causes, Risks and Treatment An ectopic pregnancy occurs when the fertilized egg attaches itself in a place other than inside the uterus. Almost all ectopic pregnancies occur in the fallopian tube and are thus sometimes called tubal pregnancies.