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I-pill can cause withdrawal bleeding. It could have resulted from the previous I-pill you took. You need to rule out infection like Bacterial vaginosis
which can also cause these symptoms. Keep good hygiene in the vaginal area. Avoid taking I-pill unless accidently there is failure of contraception
like burst condom as it has very bad side effects like weight gain, nausea
, breast tenderness, delayed cycles, heavy bleeding, irregular cycles.