1 week post Breast Augmentation and have a 'stitch' like pain under my left implant! Should i be concerned?

Given your description and assuming this is the entire story, there should be nothing to worry about.Sharp pains and discomfort can come and go as you heal after breast augmentation surgery.Be sure to call your surgeon, just to be safe.- Dr. Bryson Richards, MD

You should address this concerns with your plastic surgeon as he or she knows exactly what was done during your breast augmentation. Best of luck.

It would be a mistake to accept reassurance from a surgeon who does not know you. A call to your surgeon is in order. With some give and take over the phone he/she may be able to advise you, or may ask you to come in to be seen. The troublesome possibilities include bleeding and infection. Typically those would have finding other than just pain. Nothing I read in the narrative leads me to suspect either, but do speak with your surgeon.Best wishes.