If you're looking for heels look at Torrid. They have really cute shoes but are made for plus sized women so they usually have a little thicker heel and are made for wider feet. They were awesome during my last pregnancy when my feet swelled up and got flatter.
I also needed formal maternity clothes. I found alot at thrift stores since i did not want to spend a fortune on clothes i will not be wearing long. Plus i was able to have a larger maternity wardrobe. I like thyme for dress pants and i bought a nice blazer from there as well.
Destination maternity has great professional clothing
H&m have nice inexpensive maternity clothes and bon ton too... Both online
I love my heel boots but I switched to flat since pregnany
Thyme maternity or motherhood,, I am in Toronto . Don't know your location, try to search on net may be