It doesn't sound inherently human-specific, but somehow it is. Well, other primates have it to a lesser extent, but other placental mammals don't, and we have it worse than other primates. Why only primates have this arms race between placenta and womb, and why humans have it worse than any primate, I don't know. But it's definitely a thing. It's the reason why humans menstruate while non-primate mammals don't.