Hate the Catholic Church (I do) or religion as a whole (I also do), but per the article:
St. Theresa School argued Crisitello’s pregnancy violated the terms of her employment agreement, which required “employees to adhere to the teachings of the Catholic Church and refrain from premarital sex,” court documents say.
Agree or disagree, that all fine, but the exact reason for termination is verbatim in her contract which she signed well ahead of being fired. Is it prudish, archaic, and nonsensical? Yes. But did she sign a contract saying she wouldn’t do that and then get fired for doing that thing? Also yes.