I accidently clicked one (and only one) of my ads last month and I was so freaked out that Google was going boot me off because I've heard how strict they are. Today my first approval came.. what a relief!
It has happened before where a group of publishers were approved later than most publishers. I wouldn't worry too much. But do double check you have submitted tax and business information, and your mailing address is valid. $100 is the minimum for a check as well.