If you don't did any Dirty tricks and encourage people to click the adsense ads, that you won't be worry.
Google freeze my adsense account after i made almost 100 dolar..huhuhu.I dont know why but i'm still waiting response from google.Is there any chance to get back my account.Because there is no fraud at all.
i think you clicked yourself in your ad from some ip address and most probably you have clicked in credit cards or forex ads because they have highest dollars earning potential.