Everybody's different. My gyne was severe so the swelling wasn't as big as my gyne was, but it did look odd compared to the new shape of my chest. My surgery was three months ago and my swelling is ALMOST gone. If your gyne isn't severe, then the swelling can indeed temporarily make your chest look larger than before the surgery.
Before some of you jump in and say, "But I didn't have any swelling, Mr. Nip, so you're wrong!", remember I said, "Everybody's different".