I wore normal, loose clothing throughout my last pregnancy and will this time too. I wore my normal jeans with a belly band or long singlet to cover the fact that my fly was open, and lots of fitted but stretchy tops. I'm a similar size to you and that worked well. I also wore leggings with long tunic style tops and had one 'skater' dress that looked really cute with a bump!
I also did a lot of layers, like a long stripy singlet over leggings with a long cardi etc. Good luck, you shouldn't be stuck with just maternity wear if you find nice stretchy items!
I wore very similar to Kuddlebug during both my pregnancies.
I did get maternity jeans from Jeanswest though as I found my fly being undone uncomfy.
Lots of leggings, layers and long cardies. I had a fabulous pair of glittery black leggings that I used to wear with a stretchy bright purple mini dress, black skinny cardie and biker boots when I was heavily pregnant throughout the winter with DD.
With DS, heavily pregnant towards the end of the summer, my fave outfit, was black leggings, stripey loose singlet over a Bonds maternity singlet with a skinny cardie if it got cool. Birkenstocks on my feet.
I'm very short and petite and I found a lot of maternity stuff overwhelmed me. I'm lucky enough to be able to wear casual wear to work so I kind of found what I liked and stuck with it. Found a lot of great clothes in Op shops too.