Hi, i found it very hard too, and i talked to several mums to be who needed plus size clothes and they found it a problem as well, i feel you have to do a lot of detective work to manage to find plus size maternity clothes at affordable prices, as the shops we all know (the high street names) dominate the market, but there are lots of smaller, less well known sellers who are slowly becoming more popular. These tend to charge less for the garments, as they have to compete with the larger companies; you really need to spend time researching them!
Hope your trousers are fine and fit well. The denim jeans that I bought from Bump 4 Joy fit me very well, and are very well made. I also bought a smart white blouse and a pair of pyjamas which I am extremely happy with.
xxx