Call the issuer immediately after you realize what happened. Most companies have 24-hour access. The creditor will most likely ask you questions such as:
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When did you discover the card was lost or stolen?
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Where were the cards when you last saw them? (purse, wallet, at home, etc.)
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What other credit cards are also missing?
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Have you reported the incident to the police?
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Any other relevant information you may be able to offer. Try to save the receipts from the purchases you make with your credit card, so that if it is stolen or lost, you will have proof of the purchases that were actually yours.