The factors that determine the gap between the breasts after implants include1. How much cleavage you have to begin. Those women with cleavage before and more tissue will have less gap than those with no cleavage to start.2. Heavier patients will have less gap than thin patients.3. The width of...
Most surgeons wouldn't suggest that you start massage this early after breast augmentation anyway. You haven't caused any harm. Ask your surgeon about his specific recommendations for massage, if he even suggests that you do so.
It doesn't sound like you did any damage, in fact some mild occasional aches or pains after stretching the implant pocket this soon after surgery can be expected as you get back to exercise and normal activity. The best way to be sure is to contact your surgeon, particularly if the aches...