Anti nuptials are after the wedding and pre-nuptials are before the wedding. If you have it stored somewhere, a computer perhaps or something, open it up and do a print screen of the properties. It should tell you when the document was created and amended if at all. Yes, you should consider signing a new one with an incorporation by reference of the previous one indicating these are the same terms as the one signed prior to the wedding and that you both agree the pre-nuptial terms should still be enforceable. Include the print out of the print screen and have it all notarized.