If you've received a code when you weren't in the process of signing in to your account, someone else may have access to your details.
If this happens, please reset your password immediately – you should use at least 8 characters, including upper- and lower-case letters, numbers and symbols.
We’d also recommend that you check for suspicious activity on any other accounts you own, and never use the same password for multiple accounts.
Please see our article: Shopping safe online for more information.