ladies I woke up this morning and a part of my shin was sunk in , I didn't squeeze my leg or…

ladies I woke up this morning and a part of my shin was sunk in , I didn't​ squeeze my leg or anything and after a couple of hours it returned back to normal but I told my mom and she said that if I press in my leg and it takes long to pop back up I could be developing Edema and that I'm retaining water so I did that and noticed it takes a couple of minutes before that part of my leg returns to normal and my legs are swollen . So now I'm worried and going to the doctor on Monday . I mean I drink a gallon of water over two days for the whole week. I just love drinking water instead if juice but maybe I'm overdoing it ?