full charge capacity(mAh)=5028(MacBook Air 11" 2013). Is it alright or bad??

I recently got new 11" macbook air 2013 and has got 9 hrs battery life but just the other day i plugged the charger and forgot that i was charging my MBA(was shutdown). When i remembered it was too late the battery was fully charged and i am fearing if the battery life got decreased. The full charged capacity at the moment(mAh) is 5028 but it sometimes get 5005 and 5015 and also 5041. Is it alright or the battery life has decreased?? plz help 😢