I would say for the next 1 month it should be quite okay to do without maternity clothes.
It also depends on your existing wardrobe and how your body changes during the pregnancy. I have a mix of fitting and loose fit clothing. I don't feel comfortable in fitted clothing though I could fit some of them. I've completely stopped wearing my regular pants very early in second tri (very uncomfortable) , and skirts / shorts from 23/24 weeks. At 31 weeks, I still wear shorts with elastic bands like those from uniqlo.
My bump is small even at 7 months. My problem is that most clothing don't fit my bust which is at least 2 cup sizes bigger than pre-preg.
My personal preference is to size up from my usual, at least I still have an option to alter them when I lose weight, or continue to wear them for a while if I don't lose all the weight. Those can just get from regular clothes e-retailer during this period. I didn't buy any maternity clothes and don't intend to. Everyone is different :)
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