Old navy maternity jeans are great, not really sold in store though only online and then you can return in store (where they usually put them on a clearance rack for 50% off)
My mom let me know when she last pregnant (my baby sister) the maternity store in Edmonton said to go 2 sizes up when you're pregnant. I used to be a S post-pregnancy, and size L maternity pants were a game changer. The thrift stores were a life saver when I found the size L maternity pants. I hope helps🫶🏼
Go to value village