I would. Make sure that you have the confirmation number with you, a screenshot of your booking would be even better. There is, of course, a small risk that there will be a problem, but, speaking only for myself, I would present myself at the front desk with proof of my rezzie and assume that I will be checking in normally. Remember, too, that if the points have already been deducted, you don't really need access to your account. You have a prepaid rezzie.