I thought mine was reserved too as I was told they had traded an allocated slot with another dealership to get mine built for Week 44 delivery. I am pretty pee'd off to be honest but there is nothing I can do but wait.
To track via the Genius you will need your order number and then go onto the contact page online and start a live chat using the button at the bottom of the page: -
https://discover.bmw.co.uk/help/search
Hopefully you have better news than I did...