Fall is actually a comfortable season. The temperature is perfect since you have passed summer but not quiet in winter season either. It is windy, though, so you have to bundle up. If you are pregnant, it is not easy to look cute while wrapped up in clothing. There are few clothing ideas that might be interesting to you. You can attempt to wear a long T-shirt coupled with nice thin jacket. Long T-shirt will hug your figure nicely. It provides enough room to move around. The paired thin jacket is also a nice touch since it protects your body from harsh autumn wind, especially nearing winter.
Another idea is to wear onesie. There are plenty onesies model designed for pregnant women. They are made of stretchy and breathable materials. The clothing is comfortable. You can wear such outfit to work or even to hang out with your friends. It is also easy to match. You can wear loaf shoes or even espadrille sandals to accompany it. Simple top bun hairstyle would be like a cherry on top. In fall season, you need to dress according to the theme color: earthy. You can wear moss green or mellow brown colors clothes. They will be very suitable with the season.