You may show a loss at 2 weeks if you have lost your surgical overhydration water weight, otherwise at a month or 6 weeks you should have a pleasant surprise coming! Everybody is different, but that is a good rule of thumb. And as you go further out there may be even more varience, I know an almost surgery day twin, lost only 38 pounds, then there are people like me who are in the 60s, same surgery , our bodies just reacted differently, she's lost less but went down 2 sizes, I've only gone down 1, I'm still a little envious but she started out at a different weight point than me, Its still okay, when all said and done!