Your weight will vary day to day, that's really normal. All sorts of stuff throws it off. If stick to my calories but eat too much wheat, I way heavier the next day, periods, exercise, too much salt, can all make you gain water weight. Try to way once a week, rather than everyday, unless you log your weight every day and then take the lowest as your official weight.
Scales make me
so I tend not to way too often, especially now as my weight loss is really slowing down.