“Stop trying so hard” to get pregnant?

I always hear “I got pregnant right when we stopped trying” but I don’t understand how that works. Is it a mindset thing? Not <a href="https://play.google.com/store/apps/details?id=com.glow.android">tracking ovulation</a>? I’ve been told “just don’t try so hard and it’ll happen”.. but how do I do that?

Thoughts?