I read a story ages ago about someone who was apparently pregnant for years, I can't remember where I read it otherwise I'd link it, goodness knows what happened there, whether it was a real thing, though I can't quite figure out if a woman had a foetus in her for that length of time how infection hadn't happened as this seems like it would be likely. But anyway, that's a different thing from this, that wasn't what I read about cryptic pregnancy, I read about not producing hCG (or at least it not being detected in urine or blood when tested for it)