"Surprise" pregnancies?

J • 27 | 🇨🇦 | 🧡 | ✈️
I know of someone who deceived her boyfriend and secretly got pregnant on purpose. It makes me wonder, have any of you known someone to get pregnant or get their SO pregnant on purpose (or has it happened to you)?? It's widely just accepted that it's a crazy thing to do yet I've heard so many stories of people doing this. 
DISCLAIMER I am NOT talking about myself here, just had to put that out there. Genuinely curious how common this actually is.