Paper paycheck didn't print how can i go back and get it? it's not in the check register?

You cannot even attempt to print without saving so it is either saved to a different bank register or you never saved it and that is why it did not print. Create it again, save and print or find it by amount or payee name and edit 

Thanks for contacting the QuickBooks Community, @cpataxsolutions.

You can print a paycheck via Workers page. Here's how:

1. Click Workers in the left menu. 
2. Go to the Employees tab. 
3. Hit Paycheck List link, under the Run payroll button.
4. Select the paychecks you want to print. Change the date range if necessary.
5. Click Print.
6. A PDF will open in a new tab.
7. Pick the printer icon to print.

Take a look at these articles for more information:'

• Print paychecks in QuickBooks Online
• Printing Checks and Pay Stubs

If you have any questions or additional clarifications, let me know. I’m here to help. Have a good one!