I was squeezed during a hug. Could it have caused damage? I'm only 3 weeks post op

While it is unlikely that any damage was done to your implant, you are still at risk for bleeding in the late post-operative period. I would certainly mention this to your surgeon's office on Monday however if you notice any increase in pain or swelling before then I would seek immediate medical attention.

I'm sorry to hear this aggressive hug has concerned you, and your concerns
are appropriate--tearing an incompletely-healed capsule, displacement of
your implant, etc. Bleeding would be at the top of the "etc." part of
your list, but that is easily diagnosed by visible swelling that
essentially doubles the size of your breast, making the skin shiny and
tight, and causing pretty significant discomfort, pain, and even
numbness in the upper arm on that side. It appears that this is not a
concern by your description of "no swelling yet."Simply
examining your breasts for visibly asymmetry after the unanticipated bear hug
is another valuable test, and in the absence of swelling or asymmetry,
you probably have little to worry about. Still, localized tenderness may
indicate localized injury, and follow-up with your plastic surgeon is
essential to allay your fears and to keep your surgeon apprised of your
recent injury. Schedule an appointment soon; don't wait for your next
regularly-scheduled follow-up visit.Sounds like you note differences, and this may signify trouble. Please schedule an urgent recheck and go see your surgeon, who you will need to rely on if there
is any issue down the road. Best wishes! Dr. Tholen

It is very unlikely that a hug three weeks Postop caused any damage to your implants.   Raise this issue with your surgeon to be examined at your next visit.

Thank you for the question. It is unlikely that pressure would cause any problem 17 days after breast augmentation. It might hurt due to swelling and stretching the tissue. You should see your surgeon if there is any swelling, or if the pain persisits. Good luck.

I am sorry to hear what happened. You should be evaluated in person by your plastic surgeon to make sure there is no hematoma or other problem caused by the hug.  No online advice will be as good as a visit to your doctor.  Best wishes.Below is general information on breast augmentation. 

Its impossible to say for sure. Often times while this will cause some discomfort and possibly even some visible differences, it is usually temporary and gets better. Very rarely will trauma early on cause a permanent issue, but this is more common in higher energy traumas like a car accident. Make an appointment with your surgeon to discuss your concerns and be examined, best of luck.