Either way "For sale: baby shoes, never worn." is a good example of what we, as readers, put into a few words, just because we know it's supposed to be a story.
"clearly a shoe salesman advertising their product. no conflict there." is facetious, but does anything about it contradict the information we're given? No. But it still feels wrong, because it is supposed to be a story, it's supposed to have conflict, drama.
Whether "I'm pregnant." is happy news, sad news, angering news, disgusting news depends on the context, as do most other things about that sentence.
As authors we probably have to think about what that context really is, even if we leave a lot of it unsaid.