Dont worry, if you come from a diet plan where you are restricting calories and carbs to one where youa re eating freely you are almost certain to see a gain at first while your body adjusts to eating normally again. It won't be a fat gain though, just fluid retention! So just carry on, perhaps do red days instead of extra easty and gradually reintroduce carbs, and make sure you are drinking lots of water to help with fluid retention. Things should settle soon and you can look forward to losing again.