Is it Symmastia?
I am sorry to hear about your concerns after breast augmentation surgery. Although your concerns are understandable, your pictures do not demonstrate symmastia. You are correct in that your breast implants are quite close to the mid line and some skin elevation (tenting) may be present. If, in the long term, you remain concerned about the breast implant positioning, additional surgery (capsulorraphy) will be necessary increase the space between the breast implants. This internal suture repair of the medial implant capsule plus/minus the use of acellular dermal matrix can be very helpful when it comes to correcting breast implant displacement concerns. You may find the attached link, demonstrating several cases of symmastia helpful. Best wishes.