At your age group when the hormones have not matured yet and the cycles are usually anovulatory, a progesterone implant like NEXPLANON can often cause spotting to mild blood tinged discharge for about 6-8 months before there is complete amenorrhoea. You may choose to use antifibrinolytics, available on prescription for few days every time you get spotting to stop the bleed without affecting the contraceptive protection.
I hope i have answered your query,
wishing you good health,
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