Is this water weight?

So its been 15 or 16 days now exercising and pretty healthy eating.. no alcohol and the scale finally moved and said I'm down 2 lbs. lol

I weighed before and after gym today (drank 750ml of water during workout) and it stayed the same did I actually lose 2 pounds or is it just water or due to a bowel movement?

I'm pretty sure its just water weight but at least it moved :\