I personally see it as having sex without using protection (condoms, birth control, etc.) while also not charting, temping or taking ovulation tests. Just going with the flow and seeing what happens.
You could get pregnant using the pull-out method if you're fertile. I don't know exactly when I ovulate, I just guess. But I'm in a safe place to be doing this. No one should use the pull-out method unless they wouldn't mind getting pregnant and can take care of a child.
Whatever path you're on, good luck to you!