Why do I have my period halfway through my birth control pack?

I’m only 2 weeks into my birth control pack,
I still have almost half the hormonal pills left and I got my period today? Now,
I am very lenient with taking it I don’t usually take it at the same time every day but I do take it. Is this normal? What am I supposed to do in this situation?
Why do I have my period halfway through my birth control pack?
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