Can breastfeeding while pregnant cause early miscarriage?

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So I am currently breastfeeding my son who will be one next month. Hurray for going a whole year! I am in the process of weaning him off. He only has booby at night now. I've heard that breastfeeding while pregnant can cause miscarriage. I missed my period by two weeks but still going to wait till the end of the month to test. Worried that if I am pregnant I can miscarry.

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