custom user registration, on error forward

I’m building a theme that requires users to self register. I need more that the standard info at registration, (city, phone number, short bio, etc…) I have published a “register” page in word press and want to use that.

The issue is when the user doesn’t fill the form out correctly it forwards to the /wp-login.php?action=register. All of the fields are there and it displays the errors. How can I forward back to my published register form?

I’m thinking a hook at wp_register but am unsure of how to continue… just need a point into the right direction