Charged for what?

if this is in the wrong section, please move.

so i got a message from my credit card that ive been charged 1.98 euro and the payment was made yesterday. my apps have been paid earlier this year and i didnt download anything new yesterday. id like someone to clarify this for me please. if someone could point me in the right direction id appreciate it. 1.98 euro isnt that big of a deal but what if my details were stolen and somebody else could be using my card.

thanks