As a JW kid, I was, of course, anti-abortion.
As an adult, I became pro-choice and have stayed that way, but I have had to face the complexity of the issue personally.
Oddly, it was becoming pregnant that changed my feelings about whether or not I wanted children; I was pro-choice during both pregnancies; the first was terminated and the second was not.
The attachment that occurs to the idea of having and nurturing a child early in pregnancy can be enormously conflicting for a young woman who thought she did not want kids, and suddenly realizes that it would be lovely - hormonal or what - I dunno!
In any event, it is better for the individual and for society when individual women have more choices (and access) about the number and spacing of their children.
It's better for families, for individuals, and for societies, than for women to have fewer choices. And abortion is only one of a very few choices available in the rather common event of unplanned pregnancy.