Can’t get my breast pump until after baby arrives. What can I stock up on now?

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So, my doctor won’t “prescribe” my breast pump until after I deliver. This makes me a little nervous because I like to be really prepared for everything 😬

I’m pretty sure that I’ll be getting a Medela pump, though. So, what do I need to know or what should I buy ahead of time to have ready for when I can eventually pump?