Breastfeeding while pregnant

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Anyone breastfeeding while pregnant? Or have before? I️ want to keep breastfeeding my lil one and it keeps him calm I️ also use formula but I’m confused because when I️ first had my son I️ was told it was helping shrink my uterus back fast so I’m confused and I️ don’t trust google any more. I’m looking for personal experience until my first appointment. Thanks in advance