My mac book pro is not letting me access my computer because it says invalid password but I have not changed it

I tried opening my mac book pro this morning and its saying that my password is invalid.  I haven't done anything to my password and its not letting me log in!! What can I do?  I've already shut it down twice and restarted and still nothing.

Reset Password starting from Recovery HD
Start the computer,then press and hold down command and R keys to start into recovery partition.
When you see the Apple logo, release the keys.
Wait until  OS X Utilities window shows up.
Move the mouse to the menubar at the top and click "Utilities", then select "Terminal"
from the drop down.
Terminal window will appear.
Type in   resetpassword   and press enter on the keyboard.
Leave the Terminal window open.
Reset Password Utility window will open with Macintosh HD selected.
Select the user account from the popup menu box.
Enter a new password.
Reenter the new password for the user.
Enter a hint.
Click the "Save" button.
Click  in the menubar and select Restart.
Log in.
If Keychain dialog box appears, select “Create New Keychain”.

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