Hi and welcome.
There can be number of reasons for bleeding during a cycle most likely is hormonal imbalance or it can be just an early period. If the bleeding is mild and not associated with any other symptom nothing to worry about.Take lots of fluids and monitor the bleeding. Sometimes women can bleed during ovulation or if you are sexually active implantation bleeding is another possibility.
Let me know if you have further questions,
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Wish you good health.