did you request a trial on the page
If yes, you will have to wait a little bit longer as Oracle Cloud General Availability is not announced yet ( we expect it to be in the upcoming weeks ) , so nobody has granted any services on Cloud.
All the requests are stored in a queue, and as soon as the public announcement is made, the trials requested will be granted.
You would have received an email confirming receipt of your trial order. The services are being provisioned on a first come first serve basis. You will be notified via email no sooner your service is ready for use.