Ok, been watching what i eat every day, maintaining my calories excellently, exercising regularly, losing weight every day.......yesterday, changed exercise routine, just for the day, walked 6.5 kms ...ate no different, drank ALOT of water, and BAM 1.7kgs overnight!!!! What did I do wrong??? I weigh myself everyday, and have been losing between 300g and 700g a day.....why am i going backwards? HELP