My Mac Book Pro won't recognise my password

Hi Chris! Sorry to hear this is happening. Luckily there is a potential solution for this. I have an article below from Apple itself that will walk you through on resetting your password on your Mac

https://support.apple.com/en-us/HT202860

If you are using an older version of mac (ex. Mojave) please refer to the following link below

Change or reset the password of a macOS user account in macOS Mojave or earlier - Apple Support

I'm glad to hear it was solved! I guess the IT secret "Reboot it" has saved the day once again