Important!!!!

Hey guys, was playing a quick sand server , I then got logged out -" you are logged in from another location" I changed my password, hopefully that's it, but I know nothing about "hacking" I have bought many items on different servers, so my mc account has my credit card details!! Can anyone tell me what I should do or what just happend, also if I do happen to do something extremely unlike me, it's not me! So please tell me what to do

To clear a few things up; all the purchases you made on different servers are in no way connected to minecraft/Mojang. Most servers use either enjin or buycraft to process their payments/donations. This means that servers have no access to your credit card details, So I wouldn't worry too much about your credit card.
Tip for general Internet safety; if you don't trust a website, don't shop there, or use a 3rd party like PayPal to hide your credit card details.

Regarding your minecraft account: transfer your minecraft account to a Mojang account, if you haven't already done so. If you ever suspect anyone else using your account, then change your password.

Thanks tell, 1. For replying so quick 2. Helping me, I've don't ll of that,