How do people get pregnant on accident?!

Sheldan • 🌈BA in psych, currently working on my Psy.D. Married. one Early MC...🤰🏽🌈 #1 11/26/18. #prochoice #prolove #profreedom

from what I've gathered, its so difficult to get preggers when you are actively trying, the chances are low on any given month. In fact, a healthy couple in their 20s, who are actively ttc take up to 6 months on avg to concieve. Does anyone ever wonder how people get pregnant on accident so often when they are on bc and/or not even trying to? Not even going to lie, it is kind of frustrating to see...when my husband and I want a baby so bad and it isn't happening, yet these people who weren't even planning on it and possibly aren't ready for it just pop up pregnant. It makes me sad.