You need a travel permit before you can leave or else you will be deemed to have abandoned your I-485 application. I recommend you consult a lawyer to make sure there are no other issues with traveling in your specific situation (for ex, no unlawful presence in excess of 6 months)
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Do not do it.
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Wait to have your Advance Parol document issued before you travel. You'll both need to come back for the interview.
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You should wait and go after the interview.
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