ALWAYS ask first.
Taxiways work both ways, and to assume that you should vacate at the first exit, or at the taxiway most closely associated with where you think you might be parking is extremely foolhardy and very frustrating from our ( an atco's) point of view.
We plan ahead for the most expiditious and safest operation in both the air and on the ground, and that plan will only work if you help us by communicating, not assuming.
If you don't, the plan won't work, and you'll not only inconvenience yourself, but many others.