Wait to amend your return. The form to amend your return, Form 1040X, isn't ready yet, and it is always best to allow time to receive your original refund first before amending the return.
It is likely to make a tiny difference in your return, but as @AnthonyC points out, it is best to make the update just so that everything matches up with the records that the IRS has. While we easily see that $12 is a small number, a computer sees only a mismatch and kicks out a letter that lands in your mailbox and ruins your day. (No one likes mail from the IRS unless the envelope contains a check!)
Here is some more detailed information about how to amend your return in TurboTax when the time comes: How to amend a return in TurboTax.
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