Yeah, that dry yeast really takes off, don't it?
I'd give it a few days, and check your gravity again. Also, read up on that yeast. If you find that it's highly flocculent, you might have to swirl your fermenter a bit to rouse your yeast so it'll finish out.
I bet it's OK in a few days, though.
Edit: Of course, all the above is not knowing anyhting about your recipe, OG, mash schedule, etc. Any idea what it's supposed to finish at?