Usually, when guys start out on the grippers, there is always some sort of discomfort. This is natural because you are putting your hands through a great deal of pressure which it has not experienced before.
If it feels bad enough, take a few days off and come back. Give yourself a chance to rest and heal. Pain is your body's way of telling you that something is wrong HOWEVER don't confuse some light soreness with a outright injury! You may have suffered some pain, but is it a pain you can work through? If so, cut back a bit - if not, take some time and rest.