After you file

NO.  If you made changes after submitting you will have to first take out your changes and put your return back to the way  it was when you originally filed it.  Then you can amend.   The Amended return won't be ready until later in February.   And you need to wait to amend until the first return is done processing and you get the first refund or pay any tax due in case the IRS adjusts your return.  They may catch some mistakes for you.