It could be due to the breastfeeding/hormonal. If it's more than spotting and lasts longer than 10 days, plus the face that you are having a period every 2 weeks, you can become anemic. There are several causes for irregular periods. Examples; stress, weight gain/loss, medication, illness, climate, cyst, or polyp of the cervix, hormonal, thyroid, infection.. just to name a few.
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Healthcare Expert
17+ years, Healthcare Expert