Hello and welcome to the forum.
The first thing you need to do is …..
Use the "EYE" icon in the password text box and confirm that as you enter your password, it is being correctly interpreted exactly as you expect.
Just in case there might be some settings that have changed with respect to your default Region, Language and Keyboard layout.
IF that all seems to be correct as you would expect, then...…
You might be able to rescue your computer by enabling the normally hidden / disabled Administrator account and use that to possibly fix the password problem on your local user account.
You'll need to boot from the installation media. If you do not have the installation media on hand you can download the ISO from here
https://www.microsoft.com/en-us/software-download/windows10
Once you have the ISO, you can use ImgBurn to burn it to a DVD,
http://imgburn.com/
or Rufus to burn it to a USB ThumbDrive,
http://rufus.akeo.ie/
either of which you can use to boot your computer.
THEN...
Follow the steps outlined here
http://pureinfotech.com/2015/11/20/how-reset-windows-10-forgotten-password-regain-access-computer/
It works. I know, because I've used that method on more than one occasion.