Why do maternity clothes not accommodate for large breasts!

I was already a 32G pre pregnancy and there only getting bigger. I literally cannot get my boobs in any maternity clothes in my normal size. Going to have to return the lot and go 2 sizes up I think, my clothes will look like tents 🤦‍♀️ I only 5 foot tall and a UK size 10 but think I’ll be in XLs 😂

I thought for once for wouldn’t have issues as I naively thought maternity and nursing clothes for accommodate for larger breasts