Where's Your Filter?

Yesterday at work, I was working with one of the interns on a project. Another intern in the room (there are three total) commented that I "finally look pregnant." I think I've looked pregnant for quite a while now so that struck me as odd. But not nearly as odd as what she said next:

"Are you sure you're not having twins? You're so big!"

First, I'm actually not that big (although I sure do feel it). Secondly, where's your filter? Do you really think it's okay to say that to a pregnant woman? I know she's only 21 years old, but still. I wasn't really offended by what she said but I can't get it out of my head. Oh well, could've been worse, I guess.