Although the risk of permanent sensation loss is very low, it is possible to see temporary sensation changes that take 3-6 months to return. I typically warn patients that the larger the implant that is placed, the higher the risk of sensation changes. This is because the sensory nerve to the nipple and areola will be stretched by the implant. The good news is that most cases stretch injury to the nerve results are temporary.
I wish you a safe and healthy recovery.
Web reference: http://www.drpaulgill.com