Will my textured implants drop and fluff? (photos)

They are under the muscle size 480cc Sientra textured. My nipples are low implants are high and they slope awkward and look disconected from my actual breast. They are only a size C and I am very unhappy with the size and shape will they round out and will they look bigger. My nurse assured me I was going to be fine and they will be beautiful but right now I am having a hard time believing them.