1.your body can retain fluid
2. scales can be wrong
3. TOTM
that is just what comes off the top of my head, im a daily weigher and have watched my weight stay the same go up despite being good or reversely go down when i haven t been good. if you are going to get upset by a figure my advice is step away from the scales and chill. you sound like you might be best to stick to your official weigh in til you had some more good results and have more time to see what the diet is doing for you. otherwise your going to get disheartened and possibly cheat( what the point anyway?).
good luck,
jx