Wordpress installed + domain not active?

Hi all, apologies if this is a frequently asked question but I looked around and couldn’t find the answer.

I have registered a new domain with my shiny new Dreamhost account and installed Wordpress using the one-click install (thank you DH for making this so simple!)

WP is installed but as per the emailed instructions, I can’t access the wp-admin pages using the registered domain yet e.g. http://www.mydomain.co.uk/wp-admin - obviously this will take a while to happen because it’s a new domain.

In the meantime is there any other way I can access the Wordpress site without using this domain URL? Or do I have to wait until it’s active to work on it behind the scenes?