If you go to the hospital, they can test it to see. If I were you, I would head there soon...you don't want to stay at home for too long if your water actually has broken, so better safe than sorry. Good luck. :)
Being that your a little past your due date, it could be your water. You need to deliver within 24 hours of your water breaking so there's no risk of infection. Call and have yourself checked out. Or go on to the hospital.
Put on a pad, if you soak through it in an hour or less its your water!