Re: My story isn't listed in the writathon list?

Are there any indications on this page that you participated? 

You need to click [Participate], select which novel you are participating with, then [Enter Fiction] to start the challenge. Not everyone is included in the challenge automatically. 
Once you do the above, you will see your word count progress on this page  
If you don't see it, you did not [Participate] correctly. 

Do it now, and do it quickly then open a support ticket. Will see what we can do about the first milestone since this might've been a genuine mistake.