P.G.
Honestly, it's the pants you need to focus on, and if you can get a good black and B. pair, that'll keep you going. depending on where you work, if you have work suits with jackets, you can keep wearing the jackets - you just won't be able to button them (LOL). Since winter is coming, you may be able to get by with some sweaters that stretch. Also, it depends on how much you show - I looked like I was 6 months pregnant at 9 months so I had it easy. I did work in a professional office till 2 weeks before my delivery date, so I did the nice shirt, dark pants, jacket combo till the end.
I found the pants at Motherhood and Target, and some cute tops at Marshalls and Ross. I think I only spent around $200 on maternity clothes cuase I didn't get to big. Good luck!