It normally takes 3 months for breast implants to settle after breast augmentation. Subglandular implants settle a few weeks earlier than submuscular implants. Transaxillary breast implants are probably partially submuscular and can take longer than implants placed through other incisions.
All breasts are asymetrical before breast augmentation. The most difficult asymetry is when the inframammary crease, the fold beneath the breast is at differnet levels before surgery. It is very difficult to achieve symetry when one crease is higher than the other.
It is most difficult to correct these asymetries through the transaxillary approach, as this is a blind procedure.
If your crease was higher on the right side before surgery, then that may explain the asymetry you are seeing now.
Massage and downward displacement exercises can help and you can work harder on the right side to try to encpourage the right side to drop.
If during your surgery the right breast implant pocket was smaller and or higher than the pocket on the left, then you may be left with this asymetry and or need revisoion.
If you do need a revision, I would only do it through an inframammary incision, as this is the only way I can adjust the inferior pocket accurately and achieve symetry.
However you must wait 3 months to see if the Right side will drop. Consult yuour surgeon for advice on massage and displacement exercises. Wearing a pole wrap can also help force the right inmplant lower.
The other possibility is that the left side is too low. That is why you need 3 months to see which side you like better, which is properly placed, and if you are not symetrical by then, wheter you want ythe right side lower or the left side higher.