Thanks for the query.
I understand your concern.
Milk secretion from the breast of non-pregnant women (galactorrhea) can be seen as a side effect of combined hormonal pills due to the estrogen component in it.
But it is not commonly seen with progesterone contraceptives like Nexplanon.
As you are having milk secretion associated with blood, better to get examined.
By clinical examination and investigations like mammography, estimating the serum prolactin levels etc, the possible cause of your problem can be identified and treated.
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