While a pregnancy test may reveal a woman is pregnant, a fertilized egg can't properly grow anywhere other than the uterus. According to the American Academy of Family Physicians (AAFP), ectopic pregnancies occur in about 1 out of every 50 pregnancies (20 out of 1,000).

Are Ectopic pregnancies rare?

Left untreated, a growing ectopic pregnancy can cause life-threatening internal bleeding, and could eventually rupture the fallopian tube it's housed in. The good news is that ectopic pregnancies are relatively uncommon, occurring in just about 1 to 2 percent of pregnancies in the United States.

What percent of pregnancies are ectopic?

Without treatment, an ectopic pregnancy can cause the place where it's attached to bleed heavily or burst. This can lead to serious bleeding and even death in the pregnant woman. An ectopic pregnancy always ends in pregnancy loss. About 1 in 50 pregnancies (2 percent) in the United States is ectopic.