Stocking up

Shamara • A wife💍and mommy to a sweet 3yr old little girl👩🏽! Got an early Christmas gift and expecting #2 sept. 2018-blighted ovum Feb. 2018. Expecting a baby boy March 2. Rainbow 🌈 baby born Feb. 2020

I'm 18w3d and will have my anatomy scan on Monday. Should I start stocking up on diapers now or wait a lil longer? I know I'll start with clothes if this one is a boy and can only reuse a few white/neutral items from my daughter.