I think somebody got into my account

Troubleshooting

Change your password, turn on two-step sign-in and tell us.

1. Reset your password straight away ("Forgot password?" works even when you are signed in elsewhere).
2. Open Account → Security, "Where you're signed in", and press "Sign out everywhere else".
3. Turn on two-step sign-in with an authenticator app or a passkey, and make recovery codes. Remove any passkey or app you do not recognise.
4. Check your access log (Privacy settings) for anything you do not recognise.
5. Contact support and say what you saw.