I Have had an ad 'under review' for 4 days, all green and ready to go like yourself but until the ad is reviewed it wont go live.
Look under campaigns, then the ad's tab and see if this is the case with you also.
There are loads of example of people if you do a search of people getting really pee'd of with the time it is taking for google to review ad's.
I wanted to run a campaign to launch my new screen protectors site starting on the 2nd March, but still waiting for the ad to be cleared by the reviewers, bloody annoying.