Predicting breast changes with pregnancy is difficult. The most common things seen after pregnancy are deflation and ptosis. Kenneth Hughes, MD breast implants Los Angeles, CA
In general, blunt force trauma does not cause implant rupture. Also, if one or both of the implants ruptured, upsizing implants during replacement could be considered.
It is possible than an implant can continue to drop at 4 months following surgery. Kenneth Hughes, MD breast implants Los Angeles, CA