After you file

Definitely amend.   The withholding taken out might not cover the tax due on your total income.  And you might owe the 10% Early Withdrawal Penalty if you were under 59 1/2.

 

You should not amend until the first return has fully processed and you get the first refund or your tax due payment has cleared.  

 

How to Amend

https://ttlc.intuit.com/community/amending/help/how-to-amend-change-or-correct-a-return-you-already-...