I fell on my back 4 weeks after Breast Augmentation. Should I be worried?

Thank you for your question.  Sorry about for mishap! I can understand why you would be concerned.   An incident of falling, especially on your back, will not likely have any implications on your surgery.  Symptoms to look for that would indicate a problem would be increasing pain or size of the breast which would be related to a hematoma or bleeding within the breast pocket.   If you feel that you must be seen, I would suggest you call your surgeon.  Hope this helps.