Stocking up on supplies

I'm 22 weeks, 6 days pregnant with my first baby. Should I start stocking up on supplies or should I wait? I'm thinking about diapers wipes and formula (haven't decided if I'm formula feeding or breast feeding if I even can). I know when I was born I had colic and had to have special formula, my stomach couldn't handle breast milk. I was also allergic to certain brands of diapers. Any advice on what I should get and when is greatly appreciated!