13 Weeks Post-op and up 3 lbs in 6 days

I had my surgery on March 13, lost 45 lbs as of last Saturday, but by Tuesday, had gained back 3 lbs. I've not been doing anything different and it's not pre-menstrual water retention because I just ended my period last Thursday. I get in about 900 calories a day, 80-100 gm protein, 80-100 oz of water, and I joined the gym and started swimming on Tuesday. I would like to know if anyone else has had a similar experience and how long before your weight started going down again.

Dont you just hate that.. I want to fight with my scale every darn day..Like to throw the thing out the window but I am to addicted to it to do it LOL... Cathie post op 3/17/03 256(highest weight) 251(day of surgery)205(current weight)13anything (goal weight) -51 pounds from my highest weight and -46 pounds day of surgery weight 38% of my excess weight gone forever