There's a program on TLC called I Didn’t Know I Was Pregnant.
Here is the description;
... a compelling documentary special that explores the fascinating and utterly surprising phenomenon of women who were completely unaware that they were pregnant...until they went into labor.
I watched the stupid show and I still don't understand how someone can be pregnant and not know it. Did these women honestly not notice any changes happening to their bodies?
I vividly recall being pregnant, I found it pretty hard to ignore.