Maternity clothes

Alyssia • Thankful- Grateful- Blessed 🙌🏼🙏🏻 Alessandra Grace 💖 4/18/16 Leonel Jaxson 💙 1/22/20
Hey ladies! Just wanted to get your input on what sizes to buy maternity clothes. Most say buy your regular pre pregnancy size because they are made to stretch especially tops with the ruching sides but I'm told by close relatives to buy the size up because I want to have room to grow into them which I definitely will. But for now at 20w the bigger size seems of course big. So... Pre pregnancy size? Size bigger? Thanks for your response!