I was in game and someone entered my acount

I was in game not playing attention to the normal menu screen and sudently i noticed that a message appeared saying that someone entered my acount and then i recieved an email with a code that said something about changing login and acount stuff. I changed my password but should I be worried? I havent given my password away in years and it was only for one friend who had a much better acount than me.
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