Ok ... you learned the hard way to never use the last pay stub to file a return. Now you must WAIT until the incorrect return has fully processed AND you get the original refund. Since the IRS is matching W-2 info you entered against the info the employer sent they may catch this error for you OR send you a notice asking you to correct it. You cannot jump the gun on this ... doing so will make an even bigger mess.
You cannot change or add anything on the return that you have already e-filed. It is too late, just like when you put an envelope in a US mailbox it cannot be taken back.
Now you have to wait until the IRS either rejects or accepts your return. Which won't be until Feb 12 this year. If your return is rejected, you will be able to go into your account and add or change it and resend it.
If the IRS accepts your return, then you have to wait until it has been fully processed and you have received your refund or paid the tax due. THEN you can prepare an amended tax return 1040X but in the meanwhile, DO NOT change anything on your return until you start the amended return. If you did change or add the missing info then take it out and put your return back to the way it was when you first filed it.
You can check your efiling status here,
https://turbotax.intuit.com/tax-tools/efile-status-lookup/
How to amend an Online return
https://ttlc.intuit.com/community/amending/help/how-do-i-amend-my-turbotax-online-return/00/27577
