3 weeks post op Breast Augmentation, my breast are still not soft. Is this normal?

This is very common in the couple of weeks right after your surgery. Your breast tissue is adjusting to the implants and this tightness can compress your implants. Your breasts need to "drop". The dropping process usually takes about three to four months. Natural tissue expansion and gravity will help your breasts become more natural in appearance and feel.  However, if you are very concerned, please talk to your surgeon. They'll be able to better assess your condition.

It is not
uncommon for the breasts to still feel firm only 3 weeks following breast augmentation
surgery. This can be attributed to swelling which occurs right after surgery
and can take weeks, even months to be completely gone.  As the
swelling subsides, the breasts will soften and begin to feel and look more
natural.  Be sure to follow up with your
surgeon as to your progress.

You are still at an early stage of healing and will still have swelling. Post surgery swelling may take up to 3 months to subside completely so I would not be too concerned. You will find that things should improve over time.

There are many factors that can effect the way your breast feel post operatively. In general, as time goes on your tissues will soften, gravity will win and cause the breast to fall some, the pressure and sensation of fullness in your chest will decrease. Without know the details of your surgery... all I can say is that you are still very early in the overall course of your breast augmentation and I would expect everything to continue to improve with time. 

At just 3 weeks post-op from a breast augmentation, it is not unusual for your breasts to still feel firm.  Everyone is different when it comes to healing time, so try to be patient knowing that it can take anywhere from 3-6 months for swelling to subside and your implants to drop.  Over the next couple of months, your breasts will become softer and the shape will fill out more toward the bottom of your breasts but until then, continue to follow your surgeon's post-op instructions and most importantly, be patient.  Congratulations and best of luck! ac

Without photos, and some clinical info (size of implants, height weight, above or below the muscle) it is really difficult to comment.  I can say that at three weeks many women have implants that feel firm, yet three months later they feel soft and natural.Follow with your surgeon. All the best.