Bleeding during mini pill day 8

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I’ve been on Norlyda for 8 days now and Ive also also been on antibiotics for a uti for like 4 days. Yesterday I took my pill exactly 3 hours late and today I’m bleeding pink and cramping. Is that normal? Idk if it’s bc I took my pill 3 hours late or from the antibiotics or just from normal mini pill random bleeding. Help!!