Sounds like your wort was stratified into varying temp layers by the time you took your sample judging by the 1.01 reading. And you really need to read to the next decimal place - the reading could've been anywhere from 1.010 -1.019. Regardless I'm sure that's not your actual OG, but it's too late to know exactly now. . Is it possible that the reading at the end of fermentation was 1.020 and not 1.002 ?