Here’s where you have to quit citing rules and reason from principles.
The RULE is that abortion is never moral under any circumstances.
What you might miss in reading that rule is that abortion is defined as the direct and intentional termination of a pregnancy.
When a woman has a portion of her fallopian tubes removed because of an ectopic pregnancy, that action is not an abortion. The death of the child is an undesired, unintended but unavoidable side effect of saving the mother’s life via the removal of that section of tube.
There may be other situations where no action would result in two deaths where medical intervention intended to save one party that has the unintended side effect of killing the unborn child is a moral choice.
But don’t be fooled in political abortion debates. When a politician seeks exemption for the “health” of the mother, he’s really seeking to sap ALL enforcability out of the law. Courts have ruled that “health” means anything a woman wants it to, including how she feels about her prospects in life.
Because politics often distorts good definitions, catholics can arguably politically support exceptions to save the LIFE of the mother, but not the health.
In fairness, I’m no help to your real question since I’m nobody definitive. Just been a pro-life catholic my whole life.