I shouldn't worry too much Pinkmantha, I put on a pound yesterday but lost 2lbs today. Sometimes it goes a bit like that. Just focus on your overall loss and try not to let daily fluctuations get you down too much (easier said than done I know )
I'm a daily weigher too (3 times daily usually although I only really take stock of the morning one) and although the gains are irritating I do find that there are more losses than gains overall so it does keep me motivated. I'm not a really fast loser either so I can assess how well I'm doing in a particular week rather than being gutted at being 100% all week and only losing a pound if I only weighed in once a week. Kind of manages my expectations . I guess different things work for different people.