Most of website also takes part in Lazada or Shopee, and stocks are from China anyway.
Expect the quality to be so-so only but since I'm wearing for a few months only, didn't care.
My friend shops at Asos online but all calculated by pounds and there's shipping fees. She gave a few to me, quality quite good.

Try to buy one piece dress, the type without waistline and reaches knees or below. You will have plenty of space to fill. Some really pretty and looks good for both office and casual. Below knee length so that when your tummy grows, the front seam won't be too short for comfort.

I just found a few of my waist-less one piece (my pre-pregnancy dress) can be worn as maternity dress too. Planning to buy more of these cutting so I can still wear them after giving birth.

Or maternity long tunic. They too have plenty of space for the tummy. Just pair with maternity leggings.

Maternity shorts, jeans and a-line dress are not that flexible for continuous growth. I bought shorts in Shopee and round up one size bigger. 3 weeks delivery time. They belly part is adjustable, so you can buy bigger size and adjust.