R.A.
Really , you do not need to freak out. Sometimes things take awhile. I know for a fact working closely with my own HR office, that they sometimes get caught up in so many things that they don't get back to you for awhile, even a couple days. Being that it is friday, they probably are just wanted to get done with work for the weekend. I wouldn't worry. Most likely they are just busy. They will get back to you. If you haven't heard anything on monday, call Tuesday.