Isn't Becca supposed to be incredibly smart? *spoiler*
If she is supposed to be as smart as they are playing her to be, I really have a hard time believing that she never even considered that she was carrying Marshall's baby...
I know it was a difficult time. But within a nine month time period, she should have thought about it. That is what surprised me. Even if they had taken precautions - still!!
Just my two cents. :)