gained 1kg in 2 days but havent changed my diet!?

thinunfit

all ive done really is lifted weights these two days (resulting in a very fudging sore body now) and i didnt change my diet too much other than more protein. Today the scale said i was 1kg heavier yet i think i look pretty much the same if not even slightly leaner O.O is that even possible to gain muscle in 2 days