One of my breasts haven't dropped yet, is this normal? (Photo)

Thank you for your question!
Implants initially sit high up because the chest muscles and
surrounding breast tissues have not become accustomed to the implant resulting
in tightness. You have to allow gravity to take effect, and overtime, natural
tissue expansion will allow the implants to fall into place causing your
breasts to appear more natural, softer, and rounder. Once that happens, the
implant will sit directly behind the breast tissue in a natural 45:55 breast
ratio, and the nipples will move up higher. Currently, there may be excessive upper
pole fullness (> 55:45) on the left side, so in time, this will change.
Please note that it is not uncommon for breasts to heal and
adapt to implants at different rates. In fact, the process I described above
can occur quicker in one breast over another.
Also please note that if there was pre-existing mild breast
asymmetry before surgery, then that asymmetry will continue to exist.
You may have to wait another 3 months (i.e., total of 6
months) for the final results. If the breasts still appear different at that
point in time, then you may share your concerns with your surgeon and they should
be able to fix the problem – they will do an inframammary fold release on the left
side to help the implant drop down.
To encourage settling of the implant you must engage in
persistent inward and downward breast massaging, and perhaps wear pole wraps.
Patience is key!
Please continue to have regular follow-ups with your surgeon
to make sure your breasts are healing beautifully. Their recovery instructions
should take precedence over all else you read here as they are better informed
about your surgical details.
Hope this helps.

Thank you for your inquiry, sometimes it may take up to 6 months to see final results or implants to drop into their place. I recommend my patients having ultra sound done and also massages to help drop faster, you need to be patient, however if in 6 months maximum the implant still does not drop and you have pain an exam should be done. Best of luck! 

This is outside of the normal timeframe but it can continue to descend even after this length of time.
Try to be patient and keep your plastic surgeon "in the loop" as to your concerns.
I would wait at least 6 months before considering revision surgery.