Dont worry,
I did the same thing , except the TOM thing if that happened I am sure my wife would be kind of upset lol,

I started working out and i did not increase my water and carbs and i gained back 4lbs the first week or so.

I was frustrated but then out of no where in the 2-3 week of working out and me increasing my carbs to about 25-30 and adding more water I started loosing again.

I am no doctor but i think it has to do with our bodies wanting to hold on to everything escpecially when we start working out and you have to convince it your will keep feeding it enough etc.....