Your breast shape is described as "tuberous breasts". This means the nipples are large and the breast itself is about the same diameter (width), whereas the breast width is normally significantly wider than the width of the nipple. You have done nothing to cause this, it is a...
Judging by your before photo you had the same gap between your breasts then and the surgeon must centre any implant on your existing breast which in many women is located more on the slop of their chest leaving quite a large gap - if you bring the implants in more you leave the nipple and you...
It looks more like a reaction to the tapes or steristrips . Leave all tapes off at this stage to rat the skin and see your doctor if things are worsening