Second pregnancy and still breastfeeding baby #1

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Is anyone else still breastfeeding whilst pregnant with baby #2? If so is it safe to continue to do so? I’m worried this baby might not be getting enough nutrients because baby #1 breastfeeding about 3-4 times a day still. I did have an US at 13w and all seemed fine, I was feeling only slight movements then but now 16w and not feeling any movement. Perhaps those initial movements were all in my head…

Any advice would be greatly appreciated! 😊