Were 4 days of delayed menstrual care a concern?

It was for my menstruation to come down 23/09 and descend today 27/09 but only came a little, should I worry? I'm going to take the contraceptive fifth I return, and what will be my fertile day?
Expert answer:

Forget this menstrual "delay." You take contraception just so you do not have a fertile day.

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