I can feel my implant in one boob but not the other...under the muscle, advice?

Hard to say why you feel the implant in the upper cleavage area, it may be that you do no have a lot of soft tissue coverage. Best of luck.

Thank you for your question.  I'm sorry that you are concerned about your breast implants.  Since implants were placed under the muscle usually the better coverage prevents feeling the implant in the upper pole.  Saline implants are more likely to be palpable then silicon gel implants.  I suggested you see your plastic surgeon for an examination.  Since you are early in recovery I would expect the implants to drop and if they do the palpability may be less obvious.

It is difficult to answer your question without examining you or comparing your breasts before surgery.  The breast tissue in the side you feel the implant may have been thinner.   Follow up with your surgeon to discuss your concerns and discuss how the breasts appearance was before surgery and follow your progress.