Given that Fergie has only just announced her pregnancy, it's going to be some time before we see a bump. Fergie is looking very chic in Milan dressed in black pants, white silk shirt, plaid waistcoat and a beige (leather?) jacket.
Fergie has her own unique style and once said:
"Be aware of the trends, but only utilize the ones that work for you"
So I'm guessing that Fergie will just adapt her current style and still look GLAMOROUS (sorry had to put it in there).