Can this 15lb weight gain after my Tumescent Liposuction 4 months ago be body fluid? (photos)

I had tumescent liposuction 4 months ago. I still am wearing bellybraces, have been getting regular massages the first 3 months. I gained a lot of weight (appr. 15 pounds). This is not because of too much to drink or eat. I walk everyday 1 hour. My size is bigger then before. Plastic surgeon says I have bad luck and it will take up to a year before my belly is tight. What is this? Can this be body fluid as the docter says?. Stripes on side on picture are from brace btw so not from operation.