Puzzled

I really thought that going back to work would boost my loss, but for some reason it had the opposite affect. I was 177.2 on Tuesday morning, went up to 177.6. I'm wondering if it's because of extra water weight? I haven't gone off my food plan at all this week. I drink a lot of water when I'm home, but drink even more at work. Plus my legs swell a lot at work, so I'm chocking it up to extra water weight. I am back down to 177.2 this morning, so hopefully tomorrow I'll show a loss again. I hope so, or I may not make my goal of 170 by the end.