Hi momofgirls, and welcome! I have not seen people gain on TO before, however sometimes it does take a day or so after you have finished for your loss to show on the scale. They do give you more food in stabalization, as they are trying to help you to set up a lifestyle change in your eating habits that will help you to keep the weight off for good. Welcome!!
"Whether you believe you can or believe you can't, either way you are right."
Like Katie said, if you're noticing a gain, it may take a couple of days to show up on the scale. One thing though, for the first couple of days after TO, try to avoid red meat, and tuna. That was just a suggestion offered by my COD.