Although raspberries have some sugar in them, they have a lot of water in them as well. In effect, the water dilutes the beer, but the sugar in the raspberries raises the ABV back to the ABV prior to adding them. The raspberries may gain you a couple gravity extra gravity points (.002 +/-). It may have already fermented the raspberry sugars overnight and you didn’t even notice. If you pulled a Hydrometer sample before adding them, and compare that to a gravity sample now, you may find that it is done fermenting the raspberry sugars. And if you were adding 2 lbs of raspberries to a 5 gallon batch, you might not see a lot of activity, or if you do, it won’t last long due to the relatively small amount of sugar the raspberries provided.
So... pull a Hydrometer sample tomorrow and see where it’s at. And taste it as well. I’m pretty sure you’ll be happy.