I guess there's two parts that play a factor here: Notice and feedback.
If you've given plenty of notice (which you say you have), you'll be fine. Bit of a piss-take if you text 10 seconds before you were meant to see a WG with an excuse not to. And if you've got decent feedback on AW (no negs for cancelling, etc), then again, you should be OK.
If you've got a new profile too, you could always nuke it and sign up again, if you get any flack.