Stupid question about breastfeeding

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So my friend who breastfeeds says when you get your clostridium you only get a certain amount tell you run out than is moved to real milk. I’m 20 weeks now and leak everyday, a lot and have been since 18 weeks. I’m worried I’m gonna run out before my babies even born which sounds ridiculous! My doctor is useless with info on breastfeeding and figured I’d ask the best lol