Breast enlargement worries
I am sorry to interrupt your concerns after breast augmentation surgery. Based on your description, it sounds like you are dealing with a breast implant malposition problem. The situation is referred to as a medial malposition or symmastia if the breast implant cross the midline. Given your concerns, revisionary breast surgery may be necessary. You may find the attached link helpful to you. Please submit your photographs with your next post for more specifics. Best wishes.
without pictures it's hard to say what's going on. A monoboob is where your implants come close or touch in the middle and then your sternum would not be visible. If your sternum is protruding and your influence would be falling more to the side. It would be best to follow up with your doctor or get a second opinion by a board-certified plastic surgeon. Best of luck.