You will need to file an amended return to report these missing forms.
As you have already filed, please wait to see if your return is accepted or rejected. If rejected, you may correct and resubmit. If it is accepted, you need to file an amended return.
If you are expecting a refund, we recommend that you wait to amend until after the IRS has processed your original return and you have received your refund.
To amend your tax return, please read this TurboTax article.