I'm 5'4, normally 115 - 120. I'm 30 weeks and have already gained 25 pounds. I can't pull off the super fitted pregnancy t-shirt style dresses without wearing a Spanx pregnancy shaper, but A-line dresses and jeans w/ tees or flowy tops have been great on me.
Pea in the Pod is having a big sale today - $15 tops, $30 dresses, etc. Definitely worth a look:
https://www.apeainthepod.com/designer-warehouse-sale.html
Target also has really cute maternity wear. Some of the pieces are hit or miss, but the Ingrid and Isabel line for Target is pretty great.