The ancient Mediterranean peoples were reported to use an herb known as Silphium that, among other properties, was a highly effective abortifacient. High demand for the herb drove it to extinction in emperor Nero's time, according to reports.

A world with functional magic would have ramifications for population dynamics, especially if the practice of said magic is sufficiently taxing that reproducing female wizards are a near-impossibility. Similarly, the major causes of death in childbirth could be probably reduced to near-zero with a practicing priest in the community (something as simple as D&D's Cure Light Wounds should be sufficient to prevent most of the childbirth-related mortaility, even without more specialized magics aimed at reproduction). Overall, it's not a topic that's discussed much because it doesn't have any significant impact in game terms, but has a HUGE impact in worldbuilding terms. And Americans have traditionally displayed a peculiar aversion to their pimply-faced youths discussing anything to do with sex.