Preemie things?

Kenzi • 2 sons/1 daughter.. boy/Girl twins coming!
Is it a good idea to get a few preemie things? Clothes diapers..etc.? I've got tons of newborn and 0-3 months..and newborn/size 1 diapers but I have nothing preemie..my last baby was a 29 weeker And wore preemie clothes the first 3 months and newborn for about the same...I'm just trying to figure out if I should plan on them being that tiny being twins..