Pumping at 34 weeks!

Hey ladies I’m just wondering if it is okay to start pumping at 34 weeks? I have some friends that told me they started at 34 weeks so I’ve been doing it a couple days . I had someone else tell me it can cause a miscarriage or start labor so I haven’t pumped since. Is it okay to pump at 34 weeks or just wait until 38 weeks or wait until baby is born ? Thank you for advice !

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