Will An Excessive Microgynon Dosage Cause Any Damage?

I've been taking Microgynon 30 for 3 years now, but lately i've been on holiday twice and i've been trying to avoid periods before exams. I didn't notice but i've took 4 packs in a row. I've just had a week break now and was on my period for 4 days like usual, but will I have done any damage? I'm very worried, as I also often take 2 packs in a row.