hook before creating new user?

Hi!

I want to create a new custom post type (pupil) related to a new created user. If the user already exists I want to create a new custom post type pupil that is related to the user that has that email.

I wonder how I could achieve this (in best possible way)?
(I can’t user user_register-hook because I want to do this BEFORE the user is created. I can’t use register_post because I guess the profile-builder is handling create_new_user() ?)

Here’s some code so you understand what I’m trying to achieve:

//Count nr of occurences in user-table for submitted email-adress
 $email_form = $_POST['email'];
    $sql = "SELECT * FROM $wpdb->users";
    $sql .= " WHERE user_email = '%s'";
    $count_users_email = intval($wpdb->get_var($wpdb->prepare( $sql, $email)));

    //Check if email (from exists) already exists in the system (in users table)
    //If it doesn't, create new user into variable. If it does, store that user in variable
    //based on email-adress
    if ($count_users_email === 0) {
        $current_user = new WP_User($user_id);
    }
    else {
        $current_user = get_user_by( 'email', $email_form );
    }

    //Create a new pupil custom post-type for this user
    $user_registration_post = array(
      'post_title'      => $current_user->display_name,
      'post_type'       => 'pupil',
      'post_status'     => 'draft',             //This registration cpt is not available for public
      'post_author'     => $current_user->ID
    );
    $postid_pupil = wp_insert_post( $user_registration_post );

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