I filed on 4/18, rejected on 4/21, fixed & re-sent on 4/23. Still showing as pending on turbotax site. Should I be concerned? Do I need to do something additional?

After completing the File section and e-filing your tax return you will receive two emails from TurboTax. The first email when your tax return was transmitted and the second email when the tax return has either been accepted or rejected.

The tax return can sometimes be Pending for 24 to 72 hours before the IRS accepts or rejects the tax return.