...and J-Pop too!!!!
Should I have gotten a pledge confirmation email?
Yes KS will send you an email that you have pledged. You can't pledge twice unless you have two logins to KS.
I would recommend going back to the KS page and scrolling down. IF you pledged there will be a green box around your pledge level and it will say: You Selected. Also beneath the amount of days left in the campaign, it should say you are a backer, give the amount and a button to manage your pledge.
If you don't have these options, then your pledge did not go through.