It is difficult to give an accurate opinion without pictures, pre operative as well as post operative. It is vey early on in your healing period to make a judgement on your results. Currently your breasts will be inflamed and actively scarring. Over the next 3 to 6 months, and sometimes longer, the swelling and scarring process will subside and your breast tissue will stretch and accommodate. This will allow the implants to fall into their desired position. Please know that this may not occur at the same time for both breasts.
There are ways to intervene if this problem persists/arises, such as massaging, exercises and garments to name a few. Continue to follow up with your plastic surgeon. With an in-person examination they will be in a better position to determine if your course is normal or if some type of intervention will be required.