Did you increase your salt intake this week?
How much water did you retain?
Do you have Type 2 Diabetes or any history of coronary artery disease?
Have you changed medications or dosing strength?
These are the questions (and there are more) that any physician will ask.
Adnormal water retention can be a very serious issue and predictive of some pretty bad things.
I am not trying to get off the hook here, but if you suspect something else is wrong, then see your doctor as soon as you can.