yes, I agree with bakfed. In fact, embarrassing to admit--I actually had to take a bathroom break myself.
Here's the story:
It was lunch break so I thought I'd go outside and get something real quick and then come back for the exam.
Well, I got a turkey sandwich, but it was bigger than I expected. Trying not to waste food, I finished it all.
I came back upstairs and resumed my exam.
That's when I felt it. I had to go to the bathroom. So I took the quickest bathroom break I've ever taken--rushing out into the hallway and then immediately rushing back to the exam.
Yes, the time kept ticking.
But thankfully the study method I used trained me to do questions in a lot less time than is typically needed. So I was still able to finish exam with a just a little less than 1 minute left--even with this incident.
And good thing before the exam I used the bathroom as well. Some bathrooms at these testing centers have keycodes--
make sure you know what the key is before you start the exam. Keep extra tissue in your pockets just in case you need to blow your nose or something. But be comfortable about it. Don't get all neurotic with the mentality that you NEED to do this otherwise you'll bomb the exam. Just do it like it's what you normally do and part of your routine.
Hope my personal experience helps!