The reason for the long wait is that you've been very early and organised

. The closing date for the C period isn't for another month or so yet. After that, when the AB have all of the entries in, they can then sort out which examiners will go where, and when they will go and schedule all the exams appropriately. So you'll still have a while to wait yet because you'll have to wait for the rest of the entries to be in.
Good luck with your exam when it does come around

.