I took the injection, menstruated and started the pill and did not stop menstruation?

I started taking the contraceptive injection, and after 28 days I started menstruating and I started to take the contraceptive pill and since then it has not stopped menstruation, is there a risk of hemorrhage? What should I do to get back to normal?
Expert answer:

This bleeding can last for many days and can bleed strongly yes (usually not bleeding), you need to see a doctor.

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