I agree there is no reason to overreact yet. You increased a variable way too quickly with something that can cause extreme water retention in some people.
It's not that uncommon and plenty of people put on 10lbs of water by pushing gh way too high off the bat. Normally you would just get some very light sock lines which go away after a few weeks and not true pitting edema, but everybody is different.
Personally I would give it a week off and see if it goes away, and if not it would be wise to get checked by a doc.