hurray identity theft!!

So i was going to pay my credit card bill right now when i noticed that my checking account didnt have as much money in it as it was supposed to. So i clicked on it and found out that $400 had went to something called google adwords... which i have never used in my life. Im kinda stressin over it. tomorrow morning im going to bank of america to see if I can fix anything. I also emailed google. Hopefully something can be done. no fun.