breast pump flange size

I bought the Spectra S1, but my EDD is still 4 months away. should I buy a flange now based on my current nipple size or wait closer to EDD? #pleasehelp #firstbaby

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spectra flanges usually 24 mm..for the set.. quite easy to get.. no worries. I measure at hospital is 21 but 24 also ok ... as u pump more, it might increase or decrease also lol