way to go!!! You should be very, very proud of yourself... anytime you achieve a new goal it's a big deal...

as to the weight gain... I think that's pretty normal... you consume so much liquid and get so hot that I believe your body sorta "stores" it... it's you body being scared about what the heck you're gonna do to it next! LOL... I'm sure it'll come back off in the next couple days...