10/14/2014 12:16 pm ET

6 Surprising Facts About Your Pregnant Body

From pelvic bone separation (eek!) to the real reason you're waddling, we're betting you didn't know these six things about your pregnant body!

With all the information now available to us about pregnancy, labor, and delivery, it can be easy to feel that we know all there is to know.

But the truth is, there is still a lot of mystery surrounding pregnancy and birth. For instance, did you know that we still don't know what exactly causes labor to start?

Luckily, not all things about pregnancy need to remain a mystery. Discover six wow-inspiring ways your body changes during pregnancy.