For your consideration. Ectopic Pregnancy WebMD
Ectopic Pregnancy - Mayo Clinic
This happen to friends of mine, very sad after several attempts to get pregnant.
I know personally a mom who had an ectopic pregnancy as well as a fetus/life in the womb. To save mom and the child in the womb surgery was required to save mom and the child in the womb. It happens. Mom and offspring are living today. Had nothing been done all three would have died.
It was legally and morally accepted and medically practiced for decades before Roe vs Wade even by the staunchest of pro-lifers, and still is.
That is because it is not the intentional killing of a baby. It is the intentional removal of a diseased fallopian tube.
Therefore it is not an "exception" to the ethical principle of "no abortion" --- removal of a fallopian tube is not a method of abortion. It is a matter of double effect.