Are you sure that you need maternity clothes?
In both my pregnancies, I continued to wear all of my regular sized clothing throughout.
I usually wear leggings with fitted jersey dresses, or stretchy pencil skirts with tops, and I was still wearing all of these comfortably up to giving birth - even when I was overdue.
In my first pregnancy, I wore a maternity bra and a bump band to help support my ligaments, but in my second pregnancy, I wore my normal bra up until 1 month before giving birth, and only had to occasionally wear the bump band.
Early in my first pregnancy, I assumed I’d need maternity clothes, and bought 5 dresses, but only wore 2 of them once. They were baggy, and made me feel bigger than I was.
Maternity clothing is expensive, and often not very stylish. If you want/need a bit of extra space in your clothes, why don’t you just buy a size up in regular clothing, or looser fit styles? This would be cheaper, and you’d have lots of variety. You could always buy maternity leggings and a bra to wear underneath.