You leave for overseas, a place where you do not usually go? Always contact your credit card company. Indeed, for those who do not know, the credit card companies are equipped with computer systems to prevent fraud. So if you usually always make your spending in Canada and suddenly you start making several expenses in Prague, in Paris,… well, the bank could block your credit card. So they want to make sure to talk to you to confirm that the expenses are not frauds.
Take a little 5 minutes to call them! Especially if you leave for a long time. It could save you from unnecessary problems.