Tylenol isn't an nsaid, it's an analgesic/fever reducer. Not saying you're wrong about it being safe when taken with care, just pointing out it's not an anti-inflammatory.
Nsaids generally hit your stomach the hardest, and analgesics take shots at your liver. That's why it's often suggested to switch back and fourth during prolonged sickness/pain. It helps reduce the risk of damaging either organ if it's not just one of them taking hits over and over again. And of course, don't take more than a suggested single dose at a time.
Both types of OTC pain meds have their risks when not taken correctly, but none of those risks are giving your unborn child autism.